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• Connect to new wireless network

  - by Shawn de Wet

  Wireless networking was working perfectly on my old adsl router. Then I moved to a new home that does not have adsl, and the router has been replaced with a new 3G one. I have worked through the following links: Connecting to a wireless network and http://ubuntuforums.org/showthread.php?t=571188 I have set the router from it's default WPA-PSK encryption to WEP encryption and also to No Encryption. But when I get to dhclient -wlan0, I keep getting No DHCPOFFERS received. Yet the 2 windows machines in my home connect fine to this wirelesss network (in all encryption settings). If I try iwlist scan I can see that the wireless network is indeed visible. Where do I start scratching to see where the problem may lie.

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• Which algorithm used in Advance Wars type turn based games

  - by Jan de Lange

  Has anyone tried to develop, or know of an algorithm such as used in a typical turn based game like Advance Wars, where the number of objects and the number of moves per object may be too large to search through up to a reasonable depth like one would do in a game with a smaller search base like chess? There is some path-finding needed to to engage into combat, harvest, or move to an object, so that in the next move such actions are possible. With this you can build a search tree for each item, resulting in a large tree for all items. With a cost function one can determine the best moves. Then the board flips over to the player role (min/max) and the computer searches the best player move, and flips back etc. upto a number of cycles deep. Finally it has found the best move and now it's the players turn. But he may be asleep by now... So how is this done in practice? I have found several good sources on A*, DFS, BFS, evaluation / cost functions etc. But as of yet I do not see how I can put it all together.

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• Firefox ignore GTK theme for localhost stuff

  - by Mario De Schaepmeester

  I know this is pretty much a duplicate of How can one make firefox ignore my GTK theme entirely?, but the answers on that one are no permanent solution. It works by launching firefox from the terminal. I would like to know a solution that works for every instance of firefox no matter how it was created. There is the possibility to edit the userContent.css file, but the settings you make randomly do not apply to some sites or in some situations, strangely, even with the !important added... I have a dark GTK theme and this results in some textboxes having a black background with black text with a userContent.css that has input, textarea { color: black !important; background-color: white !important; } Update I changed a setting in about:config from true to false, namely browser.display.use_system_colors. Everything appears normal and well now, for one exception: everything that runs on localhost. This includes PHPMyAdmin and a website I am making. I would like to know if there is a solution to this.

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• Accessing host LVM partition from Windows XP through Virt.manager 0.8.5 / Qemu / KVM

  - by Nico de Smidt

  Hi, requested use case is having a Windows XP SP3 guest running in 64bit Ubuntu. (Linux pcs 2.6.35-22-server #35-Ubuntu SMP Sat Oct 16 22:02:33 UTC 2010 x86_64 GNU/Linux) I want this guest to access an LVM LV on the Ubuntu disk. I've setup the following LVM config: --- Logical volume --- LV Name /dev/storage/sdc1 VG Name storage LV UUID Zg5IMC-OlqB-prL5-fgg4-3A9A-OgKP-oZ0QkJ LV Write Access read/write LV Status available # open 0 LV Size 1.01 GiB Current LE 259 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:3 -- 1) I've setup a storage pool for /dev/storage 2) I've mkfs.vfat /dev/storage/sdc1 3) and made a virtual IDE disk in the virt-manager setup for the guest. Target device: IDE Disk 2 Source path: /dev/storage/sdc1 -- Now when running XP (guest) Windows sees a new disk in Disk Manager and want's to install a partition on it, since it believes the drive is empty. After formatting from within Windows I can put data on the new disk volume. -- Back in Ubuntu however I cannot access this this any more since it created a partition within an LVM Logical Volume. Running fdisk -l shows the following: root@pcs:/media# fdisk -l /dev/storage/sdc1 Disk /dev/storage/sdc1: 1086 MB, 1086324736 bytes 32 heads, 63 sectors/track, 1052 cylinders Units = cylinders of 2016 * 512 = 1032192 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x8d72e4f4 Device Boot Start End Blocks Id System /dev/storage/sdc1p1 1 1050 1058368+ c W95 FAT32 (LBA) -- which seems fine to me, but when trying to mount /dev/storage/sdc1p1 I get the following error: mount /dev/storage/sdc1p1 /media/xp mount: special device /dev/storage/sdc1p1 does not exist which makes sense since in lvdisplay sdc1p1 does not exist Main question: I want to mount the vfat partition in both Ubuntu and XP What am I missing here????? regards, and thanks for your consideration. Nico

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• How to build MVC Views that work with polymorphic domain model design?

  - by Johann de Swardt

  This is more of a "how would you do it" type of question. The application I'm working on is an ASP.NET MVC4 app using Razor syntax. I've got a nice domain model which has a few polymorphic classes, awesome to work with in the code, but I have a few questions regarding the MVC front-end. Views are easy to build for normal classes, but when it comes to the polymorphic ones I'm stuck on deciding how to implement them. The one (ugly) option is to build a page which handles the base type (eg. IContract) and has a bunch of if statements to check if we passed in a IServiceContract or ISupplyContract instance. Not pretty and very nasty to maintain. The other option is to build a view for each of these IContract child classes, breaking DRY principles completely. Don't like doing this for obvious reasons. Another option (also not great) is to split the view into chunks with partials and build partial views for each of the child types that are loaded into the main view for the base type, then deciding to show or hide the partial in a single if statement in the partial. Also messy. I've also been thinking about building a master page with sections for the fields that only occur in subclasses and to build views for each subclass referencing the master page. This looks like the least problematic solution? It will allow for fairly simple maintenance and it doesn't involve code duplication. What are your thoughts? Am I missing something obvious that will make our lives easier? Suggestions?

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• Stuck on Ubuntu screen during installation of 12.10

  - by Rick de Groot

  From 12.04 I changed to win 8 consumer preview and now i want to go to 12.10, however i cant seem get past the Ubuntu loadingscreen( with the dots going from white to yellow etc.) it has taken more then an hour now and all my DVD drive does is speed up and slow down every 3 seconds. So i tried it again, but nothing changed im stuck on the same spot. what could cause this problem? And even better, how do i solve it?

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• Javascript slider Image and text from php, scrollable in groups by indexes

  - by Roberto de Nobrega

  I am looking for a javascript solution that slides images with text, pulled from php. This slider will slide in groups by indexes in points. I was googling, but nothing as I need. I am going to make an example. Imagine 10 products. I need to show the principal picture, and a text below the image. It is going to show 6 products, and with points (indexes), I click and the group slides to the next group. Do you know some script.?? I know the php code, but I am a newbie with javascript.! Thanks.!! PD. I am lost of where i have to put this question. So, If this was a wrong place, let me know, and accept my apologises.! ;)

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• Javascript slider Image and text from php, scrollable in groups by indexes

  - by Roberto de Nobrega

  I am looking for a javascript solution that slides images with text, pulled from php. This slider will slide in groups by indexes in points. I was googling, but nothing as I need. I am going to make an example. Imagine 10 products. I need to show the principal picture, and a text below the image. It is going to show 6 products, and with points (indexes), I click and the group slides to the next group. Do you know some script.?? I know the php code, but I am a newbie with javascript.! Thanks.!! PD. I am lost of where i have to put this question. So, If this was a wrong place, let me know, and accept my apologises.! ;)

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• Patterns to refactor common code in multi-platform software

  - by L. De Leo

  I have a Django application and a PyQt application that share a lot of code. A big chunk of the PyQt application are copied verbatim from the Django application's views. As this is a game, I have already an engine.py module that I'm sharing among the two applications, but I was wondering how to restructure the middle layer (what in Django corresponds to the largest part of the views minus the return HttpResponse part) into its own component. In the web application the components are those of a classic Django application (with the only exception that I don't make any use of models): the game engine the url dispatcher the template the views My PyQt application is divided into: the game engine the UI definition where I declare the UI components and react to the events (basically this takes the place of the template and the url dispatcher in the Django app) the controller where I instantiate the window object and reproduce the methods that map the views in the Django app

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• How can I access the scanner functionality of my Samsung CLX 3175N over the network?

  - by Roger De Backer

  I have a Samsung CLX 3175N network capable color laser printer/scanner which was sold as being Linux compatible. Whereas the printer undeed works in the network. It has been impossible up to now to get the scanner working under Ubuntu (safe for using Windows XP running in Virtualbox on the Ubuntu client), but that is not my understanding of Linux compatibility. Is there anybody who knows a method to access a network Scanner in Ubuntu?

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• Why Adobe Air is so underrated for building mobile apps?

  - by Marcelo de Assis

  I worked with Adobe Flash related technologies for the last 5 years, although not being a big fan of Adobe. I see some little bugs happening in some apps, but I cannot imagine why a lot of big companies do not even think to use use Adobe Air as a good technology for their mobile apps. I see a lot of mobile developer positions asking for experts in Android or iOS , but very much less positions asking for Adobe Air, even when Adobe Air apps have the advantage of being multi-plataform, with the same app working in Blackberry, iOS and Android. Is so much easier to develop a game using Flash, than using Android SDK, for example. It really have flaws (that I never saw) or it is just some kind of mass prejudgement? I also would like to hear what a project manager or a indie developer takes when choosing a plataform for building apps.

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• Privacy policy and terms of use language

  - by L. De Leo

  I have a Czech registered business with which I'm serving a web app mostly (but not exclusively) targeted to Italian customers. The server is in Amsterdam. The site will be multilingual (with 4 languages supported) but for now it's Italian only. What language should the privacy policy and terms and conditions be? What law should they refer to? Could I just offer these two docs in English? (Easier to write and to maintain)

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• Drivers for Ubuntu 13.10 [on hold]

  - by Fernando De Souza Martins

  I just installed Ubuntu 13.10, my screen resolution is not fitting my screen as the ubuntu interface is all around stretching over the screen, so i thought i might install nvidia's driver that i know can let me adjust the exact resolution i need. So i began a 2 hour quest, i downloaded the driver hoping i would have a wizard to instal it, but yeah, so i tried to do a bit of research and i found that feature, i think its called in english additional drivers, but it wont show the nvidia drivers, i tried the terminal, but once i write the commands i found it asks for a password but i cant type anything once the password is asked. So, my question, obviously, how do i install this driver? I am not sure if this is appropriate, but why doesnt ubuntu have a wizard to install things? I feel like im working for the OS, when it should be the other way around, but i love the concept of linux, so im pushing forward and trying to use it. Another thing is, i had to install a bunch of drivers and applications for the drivers in windows, do i need to install any other driver? I cant change my mouse's sensibility in the os, it seems, so how do i do it? I'm sorry i'm asking all of this, but it seems necessary.

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• Is it convenient to use a XML/JSON generated based system? [closed]

  - by Marcelo de Assis

  One of my clients insists that we missed a requisite for the project(a little social network, using PHP + MySql), is that all queries are made from XML / JSON static files (using AJAX) and not directly from the database. Edit: The main reason, stated by client, is a way to economize bandwith. Even the file loading, has to be using AJAX, to avoid server side processing. We will still use a database to store and insert data. These XML / JSON files will be (re) generated whenever any data is changed by CMS or users. As the project was developed without this "technique", we'll have a lot of work ahead, so I would like to avoid that. I'm asking if it's convenient to use a XML generated based system, because I think a database is already "optimized" and secure to deal with a lot of data traffic. Other issue I'm afraid of, is a chance of conflict when a user is trying to read a XML/JSON which is being just generated.

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• Ubuntu on a USB

  - by Sander de Lange

  I was just wondering if anyone had a good experience with Ubuntu on a flash drive... I'm installing it right now. I formatted my 16GB flash drive to Ext2 because the default file system is ext4 but that one is journaled and USB flash drives do not like journaling. I want to use this to learn Java and Ubuntu seems to be a great OS for this. I (obviously) have USB 2.0 ports where I will put the USB in. How is the boot time of Ubuntu on a USB?

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• Greek Letters rendered incorrectly in LibreOffice

  - by Matheus de Araújo

  Using an old archive that I have (with Maxwell's equations), the Greek letters display as squares. I tried to change something in the alphabet but even the fonts don't have any Greek letters (they appear like squares too), both Greek and iGreek letters packages. Sounds like a package that's not installed, or corrupted. I still re-downloaded and reinstalled LibreOffice. I don't know what I have to install. The equations look fine in OpenOffice.org (I made the file with it). What should I do?

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• LibreOffice Math problem with greek letters

  - by Matheus de Araújo

  I've a problem with my LibreOffice. Using an old archive that I have (with the Maxwell's equations), the greek letters are like squares. I tried to change something in the alphabet but even the font don't have any greek letters (they appear like squares too), both Greek and iGreek letters package. Sounds like a packet that isn't installed or corrupted, but I still redownloaded and reinstalled the LO and I don't know whose I have to install. With the OO my equations worked well (I made the file with it). What am I supposed to do?

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• In a SSL web application, what would be the vulnerabilities of using session based authentication?

  - by Thomas C. G. de Vilhena

  I'm not sure the term even exists, so let me explain what I mean by "session based authentication" through some pseudo-code: void PerformLogin(string userName, string password) { if(AreValidCredentials(userName, password)) { Session.Set("IsAuthenticated", true); } else { Message.Show("Invalid credentials!"); } } So the above method simply verifies the provided credentials are valid and then sets a session flag to indicate that the session user is authenticated. Under plain HTTP that is obviously unsafe, because anyone could hijack the session cookie/querystring and breach security. However, under HTTPS the session cookie/querystring is protected because client-server communication is encrypted, so I believe this authentication approach would be safe, wouldn't it? I'm asking this because I want to know how authentication tickets can improve web applications security. Thanks in advance!

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• I cant install ubuntu 12.04 on my dell latitude d510

  - by Jose de Jesus

  I download the iso from Ubuntu.com and burned into a CD-R with the program in the page. The disc work right in my desktop but when i run it in my laptop appears another menu with the options prove ubuntu, install ubuntu, check the memory, check for errors, and run windows.When i try the option install appears in the screen "Ubuntu" in the center and littles points down (loading) and after 5 minutes the computer freeze. What can i do?

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• What could be the reason for my resolution to be right running 11.10 on VirtualBox and not on machine?

  - by Hadrian de Oliveira

  When I install Ubuntu 11.10 on my VirtualBox (running on Windows 7) and update the packages, it recognizes the display as the VirtualBox display, and gives me the options of various resolutions, one of them being right for my display, all works well. But then, when i install it on my machine (like was Windows 7) it doesn't give me the resolution options, even with the system updated and the openchrome graphics driver installed (which was also when running on Virtualbox). What could be the reason for this happening? (Could the VB guest software influence on this?)

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• How to get warnings when compiling fx files

  - by jdv-Jan de Vaan

  When I compile DirectX shaders (.fx files), I dont see any compiler warnings unless there was an error in the effect. This happens both when using the offline FXC compiler, as well as calling SlimDx's CompileEffect (which is what we normally do). I could force warnings as errors (/WX), but if you enable that, you get an error that compilation failed, without the warning that caused the problem. So how can I output warnings for shaders that compile properly?

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• Ubuntu unstable, showing awkward behavior

  - by Christophe De Troyer

  Let me start off by saying that this problem can't be described in such a way that allows me to find other topics, which have some relevance to this problem. That's why I created this question. In case this question might have been asked before, I apologize. So what is the problem: My computer (Intel Core I5 2500K - with HD3000 graphics -, 6 gb DDR, 1 SSD, 3 HDD's and an Asus P8Z68 mobo) runs Windows on the SDD. But I decided to give Ubuntu a chance to be my daily OS for basic needs since it's open source and I find it a handicap of not being able to work with it. I decided to run the windows installer and install Ubuntu 12.04 to my 320 Gb hdd which was not being used in my computer. After installing it and booting it, it worked great! I spent the rest of the day/night using it, and falling for it. Great, today I booted Ubuntu (I had the choice in the bootloader as I expected). It asked me for my login and it started logging in. Now, after a few (literally) minutes of letting it "boot" I tried determining the cause of this. What I've figured out so far: When I left click on my desktop it freezes completely for a few seconds I have something like tearing in the left side menu (in games, you know) when I move my mouse around It runs well when just hovering around with my mouse, but from the point I click on something it freezes. What have I tried? I ran a HD Tune diagnostic on the HDD but the performance seems to be very close to the stock values, so I'm taking it as a good HDD. I'm trying to get to the drivers update panel for Ubuntu, but with the state it's in, it's taking a lot of time.. Could anyone point me in a direction for troubleshooting this? I'm not really a noob at all, just when using Linux.. :) Thanks in advance! Christophe,

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• Power button missing

  - by Christophe De Troyer

  An almost clean install of Ubuntu 13.10 keeps hiding the power button. I noticed before that my clock and power button were missing in the right top corner. I rebooted my system and they were back. Now I see my power button only is missing. How do I go about fixing this? I can't keep rebooting, can I? The latest thing I did was removing Ubuntu One: Removing Ubuntu One I don't think I did something that might've tinkered with these settings though.

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• Looking for a customizable "Did you know..." dialog application

  - by Jorge Suárez de Lis

  I want to deploy a "Did you know..." or "Tip of the day" application at the office. It should: Show a dialog at login time with a random tip. Obviously, provide some way to store my own tips. Be easy to disable and reenable by the user itself. I'm using puppet, so I'm covered with the deployment. The tips don't even need to be gathered from a server, since I can deploy the newest tips file/database with no costs. Sure, I could hack a quick solution by using zenity and bash, but I'd like to know if there's any application out there specifically targeted at this. I don't like the zenity approach very much because it's very limited on the contents that can be displayed. No text alongside screenshots, for example. Zenity is aimed towards displaying simple dialogs.

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• Redirect error in Google Webmaster Tools report

  - by Aurelio De Rosa

  I built a CMS and I used it to create the following website http://www.tkdmontecatini.com . After some days, Google Webmaster Tools started to give me several "Redirect error" on some pages like the follows: http://www.tkdmontecatini.com/it/photogallery http://www.tkdmontecatini.com/it/pagina/9/Informazioni/Corsi/Chi-Siamo http://www.tkdmontecatini.com/it/pagina/2/Informazioni/Eventi/Eventi The funny things are: If I access those links from a browser, it's all right and I've not redirect loops or other similar issues If I use the "Fetch as Googlebot" function, I get a great "Success" result Question: Any idea of why this happens and how can I fix it?

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