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• Update Manager Not working

  - by Deena

  Hi When I try to press CHECK Button in Updated, it is not looking for updates available. getting below error. "Failed to Download repository information" Check your Internet connection.. W:GPG error: http://archive.canonical.com oneiric Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <[email protected]> W:GPG error: http://archive.canonical.com lucid Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <[email protected]> W:Failed to fetch gzip:/var/lib/apt/lists/partial/archive.ubuntu.com_ubuntu_dists_oneiric_main_source_Sources Hash Sum mismatch E:Some index files failed to download. They have been ignored, or old ones used instead. Ubuntu Version 11.10

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• Certain Keyboard shortcuts not working

  - by user968808

  I have the logitech k800 keyboard but can't seem to get certain shortcuts working. I change in the keyboard shortcut settings volume up and down and it actually takes the key assignment but does not take effect when trying to use. After trying for a while I also tried to create a custom shortcut after with the command amixer -q sset Master 10%- Finally I tried changing the command to touch a file to see if it is actually responding but nothing. How can it take the key as an assignment in the shortcut settings but not to actually respond when pressing it. FYI other keys work like mute, next track etc. There is just 3 keys shortcuts not currently working. Thanks

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• How can I tell what error grub has when I can't read what it's saying?

  - by RolandiXor - The Ice Man

  Grub won't allow me to get into any systems on my HP dv7 (it runs 12.10). As the screen is broken, I can't read what the error is. Nothing works, not even the recovery mode. It gives me some error about "cannot find" (I think) and Press any (I guess key?) When a press a key I'm dropped back to the menu. At the moment I'm trying all the recovery options I know. However, it would be great if someone could tell me how to know what error grub is facing from a live cd or something (maybe a log file or something could help)? NB: I can view the filesystem from a liveCD, and I did check the filesystem - it was clean.

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• Usb boot device totally unable to be formatted

  - by fuqda

  I'm really upset by now, I've been trying 2hours straight to format a stupid usb drive (I'm new to ubuntu and I dont know if I will last long at this rate) Basically this was the lubuntu boot usb key I tried to remove files with sudo rm I tried to format disk with disk utility I tried to format disk with gparted (with unmounting beforehand) NOTHING WORKS. I cant delete a file. I cant move a file to the usb key. I cant do anything. This is really infuriating.. I dont know what to do ? here are some gparted errors while trying to format to fat32 after unmounting error fsyncing/closing/dev/sdb: input/output error input/output error during write on /dev/sdb when I try to remove by hand, it says "read-only file"

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• Enterprise Secrets Often at Risk, Report

  A Microsoft-sponsored survey found IT security organizations aren't spending enough protecting trade secrets and other key bits of confidential corporate information.

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• xubuntu keyboard application shortcuts not working

  - by Guanidene

  I am using the latest Xubuntu 13.04 with Xfce 4.10. I have issues while setting "Application Shortucts' from 'Settings Manager Keyboard Application Shortcuts'. Not all custom keyboards shortcuts, which I have added, work. Some do, some don't. Example the command 'xdotool key XF86AudioPause' works perfect from cmdline, but not when I assign this as a shortcut to some key, say 'F11'. Have tried to Google about this, but found nothing. Kindly help. If possible, kindly provide me a cmdline way to set a keyboard shortcut

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• How do I edit keyboard preferences from the command line?

  - by jumpnett

  I want to swap the Caps Lock and Escape key as specified in this answer: Use the keyboard preferences to swap Caps Lock and Escape - seriously, how often do you use Caps Lock? Using vim you will be using Escape all the time, and having it available on the home row makes a huge difference. With the standard Ubuntu desktop, go through the menus: System - Preferences - Keyboard - Layouts tab. Then hit the "Layout Options" button, click on the triangle next to "Caps Lock key behaviour" and select "Swap ESC and CapsLock". but, I'm using Ubuntu Server with no gui, so how would I do this from the command line?

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• Classless tables possible with Datamapper?

  - by barerd

  I have an Item class with the following attributes: itemId,name,weight,volume,price,required_skills,required_items. Since the last two attributes are going to be multivalued, I removed them and create new schemes like: itemID,required_skill (itemID is foreign key, itemID and required_skill is primary key.) Now, I'm confused how to create/use this new table. Here are the options that came to my mind: 1) The relationship between Items and Required_skills is one-to-many, so I may create a RequiredSkill class, which belongs_to Item, which in turn has n RequiredSkills. Then I can do Item.get(1).requiredskills. This sounds most logical to me. 2) Since required_skills may well be thought of as constants (since they resemble rules), I may put them into a hash or gdbm database or another sql table and query from there, which I don't prefer. My question is: is there sth like a modelless table in datamapper, where datamapper is responsible from the creation and integrity of the table and allows me to query it in datamapper way, but does not require a class, like I may do it in sql?

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• What's the best way to cache a growing database table for html generation?

  - by McLeopold

  I've got a database table which will grow in size by about 5000 rows a hour. For a key that I would be querying by, the query will grow in size by about 1 row every hour. I would like a web page to show the latest rows for a key, 50 at a time (this is configurable). I would like to try and implement memcache to keep database activity low for reads. If I run a query and create a cache result for each page of 50 results, that would work until a new entry is added. At that time, the page of latest results gets new result and the oldest results drops off. This cascades down the list of cached pages causing me to update every cache result. It seems like a poor design. I could build the cache pages backwards, then for each page requested I should get the latest 2 pages and truncate to the proper length of 50. I'm not sure if this is good or bad? Ideally, the mechanism I use to insert a new row would also know how to invalidate the proper cache results. Has someone already solved this problem in a widely acceptable way? What's the best method of doing this? EDIT: If my understanding of the MYSQL query cache is correct, it has table level granularity in invalidation. Given the fact that I have about 5000 updates before a query on a key should need to be invalidated, it seems that the database query cache would not be used. MS SQL caches execution plans and frequently accessed data pages, so it may do better in this scenario. My query is not against a single table with TOP N. One version has joins to several tables and another has sub-selects. Also, since I want to cache the html generated table, I'm wondering if a cache at the web server level would be appropriate? Is there really no benefit to any type of caching? Is the best advice really to just allow a website site query to go through all the layers and hit the database every request?

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• Cover Blown on Windows 8 Release?

  Did a former Microsoft employee post projected ship dates for upcoming key products like Windows 8?

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• How to set up an rsync backup to Ubuntu securely?

  - by ws_e_c421

  I have been following various other tutorials and blog posts on setting up a Ubuntu machine as a backup "server" (I'll call it a server, but it's just running Ubuntu desktop) that I push new files to with rsync. Right now, I am able to connect to the server from my laptop using rsync and ssh with an RSA key that I created and no password prompt when my laptop is connected to my home router that the server is also connected to. I would like to be able to send files from my laptop when I am away from home. Some of the tutorials I have looked at had some brief suggestions about security, but they didn't focus on them. What do I need to do to let my laptop with send files to the server without making it too easy for someone else to hack into the server? Here is what I have done so far: Ran ssh-keygen and ssh-copy-id to create a key pair for my laptop and server. Created a script on the server to write its public ip address to a file, encrypt the file, and upload to an ftp server I have access to (I know I could sign up for a free dynamic DNS account for this part, but since I have the ftp account and don't really need to make the ip publicly accessible I thought this might be better). Here are the things I have seen suggested: Port forwarding: I know I need to assign the server a fixed ip address on the router and then tell the router to forward a port or ports to it. Should I just use port 22 or choose a random port and use that? Turn on the firewall (ufw). Will this do anything, or will my router already block everything except the port I want? Run fail2ban. Are all of those things worth doing? Should I do anything else? Could I set up the server to allow connections with the RSA key only (and not with a password), or will fail2ban provide enough protection against malicious connection attempts? Is it possible to limit the kinds of connections the server allows (e.g. only ssh)? I hope this isn't too many questions. I am pretty new to Ubuntu (but use the shell and bash scripts on OSX). I don't need to have the absolute most secure set up. I'd like something that is reasonably secure without being so complicated that it could easily break in a way that would be hard for me to fix.

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• Adopt a Java EE 7 JSR!

  - by reza_rahman

  Broad community participation is key to the success of any technology worth it's salt. The Adopt-a-JSR program was launched in recognition of this fact. It is an initiative by some key JUG leaders around the World to encourage JUG members to get involved in a JSR and to evangelize that JSR to their JUG and the wider Java community, in order to increase grass roots participation. There are a number of JUGs that have already jumped in like the Chennai JUG, SouJava, London Java Community, BeJUG, GoJava, Morrocco JUG, Campinas JUG and ItpJava. Note that any developer can participate, there isn't a need to be a JUG leader. There are a number of Java EE 7 JSRs that could use your help right now including WebSocket, JSON, Caching, Concurrency for EE, JAX-RS2 and JMS2. Find out more here.

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• Help with ubuntu 11 mis-displays

  - by Alfa9Dev

  So, I sea This tutorial, and I exectued this line in my terminal : sudo add-apt-repository ppa:lubuntu-desktop/ppa & sudo apt-get install lubuntu-desktop and my left-side panel changed abit, while the Dash Home changed to become like so : http://i43.tinypic.com/2vuc0lj.png ! help ! How can I change to the ubuntu default style or ppa ! because whene I run this : sudo add-apt-repository ppa:ubuntu-desktop/ppa it gives me the follwing notice : gpg: requesting key A1231595 from hkp server keyserver.ubuntu.com gpg: key A1231595: "Launchpad PPA for Ubuntu Desktop" not changed gpg: Total number processed: 1 gpg: unchanged: 1 does this mean that the ubuntu ppa isn't changed or what ?? Please, help any help would very appreciated :)

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• How do you assign commands to keys to in Terminal?

  - by NES

  Is there a solution to assign special key combinations to words in terminal use. For example the less command is very usefull and i use i a lot to pipe the output of another process through it. The idea would be to set up special key combinations that are only active in terminal use assigned to write different commands? So pressing CTRL + l in terminal window could write | less or CTRL + G could stand for | grep Note: i just mean adding the letters to commandline not execute the finally. A similar way what's tabcompletion but more specific.

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• Authentication error when trying to upgrade from 11.10 to 12.04

  - by mahmuodmasri

  I wrote : ~$ do-release-upgrade and the system says: Checking for a new ubuntu release Get:1 Upgrade tool signature [198 B] Get:2 Upgrade tool [1551 kB] Fetched 1551 kB in 6s (167 kB/s) extracting 'precise.tar.gz' authenticate 'precise.tar.gz' against 'precise.tar.gz.gpg' exception from gpg: GnuPG exited non-zero, with code 2 Debug information: gpg: Signature made Thu 11 Oct 2012 07:47:10 AM EET using DSA key ID 437D05B5 gpg: can't open `/etc/apt/trusted.gpg' gpg: keydb_search failed: file open error gpg: Can't check signature: public key not found Authentication failed Authenticating the upgrade failed. There may be a problem with the network or with the server. Please help me!

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• JOB OF THE WEEK

  - by Maria Sandu

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-family:"Calibri","sans-serif"; mso-ascii- mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi- mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} My name is Pascaline and I am the EMEA Solution Response Manager. I currently have a role open for a Benelux Solution Response Representative to jump-start his/her career in my international team of six people from all across Europe. Key for this exciting role is that you are curious to learn, like networking and constantly want to develop yourself. To help you with that, you will get extensive product trainings and workshops on all Oracle product lines and you will receive sales training. Further, you have the opportunity to get certified on Oracle products through online trainings and workshops. Every month you will also benefit from 1-on-1 sales coaching and regular coaching from me to help you grow and develop your career at Oracle! The role will include the follow-up of marketing events and online marketing activities with current Key Accounts in the Benelux. It is truly a pioneering role at Oracle as it is the first time that an employee will engage in business conversations about all lines of businesses and products ranges with Key Accounts. So are you interested to work in between marketing and sales? Do you want to work for a big IT multinational? Do you want to work abroad after you graduate and do you want to develop yourself? Then please visit this link for more information.

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• Code for Controlling the Bike in a bike game

  - by user1489257

  I'm new(ish) to Actionscript 3 and I was wondering what the code what would be like for controlling the bike in a game. I have a two main questions: Is Box2D the best physics engine to go with for this type of game? How would the animation of the bike work. Would I have to create a bike animation of the wheels moving and make it start and stop when the key to go forward is pressed. How would I go about it slowly stopping when the key to go forward is released? Thanks.

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• Syanptics Touchpad Won't Re-enable

  - by user71607

  I disabled my Synaptics touchpad while a key on my keyboard and now I can't get it to work again. When I press that key again it says the touchpad turns back on but will not work at all. Rebooting doesn't help, and I tried installing touchpad-indicator but when I try to enable from there it says that it enables, but the icon remains like it's disabled. The odd thing is that it works on the lock screen so I know the drivers aren't messed up, it's just a setting. Also, the touchpad works on guest mode but still nothing on my account. I tried using gconf to set the touchpad_enable to true and it worked, it sure set it. Doesn't make a difference though, my touchpad is still useless. Terminal commands I've used: gconftool-2 --set --type boolean /desktop/gnome/peripherals/touchpad/touchpad_enabled true synclient Touchpadoff=0 modprobe psmouse

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• Unable to stop TOSHIBA TransMemory

  - by user66498

  I have a USB,when I choose safety remove, occur this error message.How to solve the problem? Unable to stop TOSHIBA TransMemory Error detaching: helper exited with exit code 1: Detaching device /dev/sdb USB device: /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2) SYNCHRONIZE CACHE: synchronize cache(10): Fixed format, current; Sense key: Key=9 Additional sense: Logical unit not ready, cause not reportable Info fld=0x0 [0] FAILED: No such file or directory (Continuing despite SYNCHRONIZE CACHE failure.) STOP UNIT: start stop unit: transport: Host_status=0x07 [DID_ERROR] Driver_status=0x00 [DRIVER_OK, SUGGEST_OK] FAILED: No such file or directory

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• Does home directory encryption depend on gnome keyring?

  - by pedorro

  My gnome-keyring has somehow gotten messed up. It prompts for a password (that I know I never provided - yes I chose 'unsafe storage'). None of the possible passwords that I use (including empty) are working. So basically I want to delete the default key so I can start over. I just want to confirm that this isn't somehow tied to my home directory encryption. I want to be sure that if I delete the default key from it, I will still be able to log in normally and decrypt my home directory. It seems likely that they're unrelated as the keyring is within the home directory and is thus itself encrypted, but I just thought I'd ask. Anyone have any thoughts?

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• "Using Database Advisors"

  Get advice on key management challenges and improve performance in Oracle Database 11g.

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• Is it good practice to keep 2 related tables (using auto_increment PK) to have the same Max of auto_increment ID when table1 got modified?

  - by Tum

  This question is about good design practice in programming. Let see this example, we have 2 interrelated tables: Table1 textID - text 1 - love.. 2 - men... ... Table2 rID - textID 1 - 1 2 - 2 ... Note: In Table1: textID is auto_increment primary key In Table2: rID is auto_increment primary key & textID is foreign key The relationship is that 1 rID will have 1 and only 1 textID but 1 textID can have a few rID. So, when table1 got modification then table2 should be updated accordingly. Ok, here is a fictitious example. You build a very complicated system. When you modify 1 record in table1, you need to keep track of the related record in table2. To keep track, you can do like this: Option 1: When you modify a record in table1, you will try to modify a related record in table 2. This could be quite hard in term of programming expecially for a very very complicated system. Option 2: instead of modifying a related record in table2, you decided to delete old record in table 2 & insert new one. This is easier for you to program. For example, suppose you are using option2, then when you modify record 1,2,3,....,100 in table1, the table2 will look like this: Table2 rID - textID 101 - 1 102 - 2 ... 200 - 100 This means the Max of auto_increment IDs in table1 is still the same (100) but the Max of auto_increment IDs in table2 already reached 200. what if the user modify many times? if they do then the table2 may run out of records? we can use BigInt but that make the app run slower? Note: If you spend time to program to modify records in table2 when table1 got modified then it will be very hard & thus it will be error prone. But if you just clear the old record & insert new records into table2 then it is much easy to program & thus your program is simpler & less error prone. So, is it good practice to keep 2 related tables (using auto_increment PK) to have the same Max of auto_increment ID when table1 got modified?

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• event table in php [closed]

  - by user66403

  How to create php code for fetch the time and date by using id from database two tables have to create named event & event_time --1. table name event(1. event_id, 2.event_date) these are the 2 fields & this(event_id) is primary key --2. table name event_time(1.event_id(foreign key) 2.event_sub_id 3.event_time) these are the 3 fields. if we give date it should display time from 12am to 12pm (24hrs) if anyone knows please post the answer immediately its very urgent please please please...

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• RSA Encrypt / Decrypt Problem in .NET

  - by Brendon Randall

  I'm having a problem with C# encrypting and decrypting using RSA. I have developed a web service that will be sent sensitive financial information and transactions. What I would like to be able to do is on the client side, Encrypt the certain fields using the clients RSA Private key, once it has reached my service it will decrypt with the clients public key. At the moment I keep getting a "The data to be decrypted exceeds the maximum for this modulus of 128 bytes." exception. I have not dealt much with C# RSA cryptography so any help would be greatly appreciated. This is the method i am using to generate the keys private void buttonGenerate_Click(object sender, EventArgs e) { string secretKey = RandomString(12, true); CspParameters param = new CspParameters(); param.Flags = CspProviderFlags.UseMachineKeyStore; SecureString secureString = new SecureString(); byte[] stringBytes = Encoding.ASCII.GetBytes(secretKey); for (int i = 0; i < stringBytes.Length; i++) { secureString.AppendChar((char)stringBytes[i]); } secureString.MakeReadOnly(); param.KeyPassword = secureString; RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider(param); rsaProvider = (RSACryptoServiceProvider)RSACryptoServiceProvider.Create(); rsaProvider.KeySize = 1024; string publicKey = rsaProvider.ToXmlString(false); string privateKey = rsaProvider.ToXmlString(true); Repository.RSA_XML_PRIVATE_KEY = privateKey; Repository.RSA_XML_PUBLIC_KEY = publicKey; textBoxRsaPrivate.Text = Repository.RSA_XML_PRIVATE_KEY; textBoxRsaPublic.Text = Repository.RSA_XML_PUBLIC_KEY; MessageBox.Show("Please note, when generating keys you must sign on to the gateway\n" + " to exhange keys otherwise transactions will fail", "Key Exchange", MessageBoxButtons.OK, MessageBoxIcon.Information); } Once i have generated the keys, i send the public key to the web service which stores it as an XML file. Now i decided to test this so here is my method to encrypt a string public static string RsaEncrypt(string dataToEncrypt) { string rsaPrivate = RSA_XML_PRIVATE_KEY; CspParameters csp = new CspParameters(); csp.Flags = CspProviderFlags.UseMachineKeyStore; RSACryptoServiceProvider provider = new RSACryptoServiceProvider(csp); provider.FromXmlString(rsaPrivate); ASCIIEncoding enc = new ASCIIEncoding(); int numOfChars = enc.GetByteCount(dataToEncrypt); byte[] tempArray = enc.GetBytes(dataToEncrypt); byte[] result = provider.Encrypt(tempArray, true); string resultString = Convert.ToBase64String(result); Console.WriteLine("Encrypted : " + resultString); return resultString; } I do get what seems to be an encrypted value. In the test crypto web method that i created, i then take this encrypted data, try and decrypt the data using the clients public key and send this back in the clear. But this is where the exception is thrown. Here is my method responsible for this. public string DecryptRSA(string data, string merchantId) { string clearData = null; try { CspParameters param = new CspParameters(); param.Flags = CspProviderFlags.UseMachineKeyStore; RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider(param); string merchantRsaPublic = GetXmlRsaKey(merchantId); rsaProvider.FromXmlString(merchantRsaPublic); byte[] asciiString = Encoding.ASCII.GetBytes(data); byte[] decryptedData = rsaProvider.Decrypt(asciiString, false); clearData = Convert.ToString(decryptedData); } catch (CryptographicException ex) { Log.Error("A cryptographic error occured trying to decrypt a value for " + merchantId, ex); } return clearData; } If anyone could help me that would be awesome, as i have said i have not done much with C# RSA encryption/decryption.

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• Where to Store the Protection Trial Info for Software Protection Purpose

  - by Peter Lee

  It might be duplicate with other questions, but I swear that I googled a lot and search at StackOverflow.com a lot, and I cannot find the answer to my question: In a C#.Net application, where to store the protection trial info, such as Expiration Date, Number of Used Times? I understand that, all kinds of Software Protection strategies can be cracked by a sophiscated hacker (because they can almost always get around the expiration checking step). But what I'm now going to do is just to protect it in a reasonable manner that a "common"/"advanced" user cannot screw it up. OK, in order to proof that I have googled and searched a lot at StackOverflow.com, I'm listing all the possible strategies I got: 1. Registry Entry First, some users might not have the access to even read the Registry table. Second, if we put the Protection Trial Info in a Registry Entry, the user can always find it out where it is by comparing the differences before and after the software installation. They can just simply change it. OK, you might say that we should encrypt the Protection Trial Info, yes we can do that. But what if the user just change their system date before installing? OK, you might say that we should also put a last-used date, if something is wrong, the last-used date could work as a protection guide. But what if the user just uninstall the software and delete all Registry Entries related to this software, and then reinstall the software? I have no idea on how to deal with this. Please help. A Plain File First, there are some places to put the plain file: 2.a) a simple XML file under software installation path 2.b) configuration file Again, the user can just uninstall the software and remove these plain file(s), and reinstall the software. - The Software Itself If we put the protection trial info (Expiration Date, we cannot put Number of Used Times) in the software itself, it is still susceptible to the cases I mentioned above. Furthermore, it's not even cool to do so. - A Trial Product-Key It works like a licensing process, that is, we put the Trial info into an RSA-signed string. However, it requires too many steps for a user to have a try of using the software (they might lose patience): 4.a) The user downloads the software; 4.b) The user sends an email to request a Trial Product-Key by providing user name (or email) or hardware info; 4.c) The server receives the request, RSA-signs it and send back to the user; 4.d) The user can now use it under the condition of (Expiration Date & Number of Used Times). Now, the server has a record of the user's username or hardware info, so the user will be rejected to request a second trial. Is it legal to collection hardware info? In a word, the user has to do one more extra step (request a Trial Product Key) just for having a try of using the software, which is not cool (thinking myself as a user). NOTE: This question is not about the Licensing, instead, it's about where to store the TRIAL info. After the trial expires, the user should ask for a license (CD-Key/Product-Key). I'm going to use RSA signature (bound to User Hardware)

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