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• How to start vnc server on-demand (not on boot)

  - by QRohlf

  I have a vps which has the basic xfce environment & tightvncserver installed. I would like to have tightvncserver automatically start whenever I initiate a connection to the port it runs on (in my case, 5901). I've seen posts about using inetd or xinetd to do this, but I've also seen lots of posts saying that (x)inetd is not included in Ubuntu for a reason, and that it's a bad idea to use it. Anyways, I'm looking for a way to auto-start tightvncserver whenever there's an incoming connection to port 5901, preferably with as few dependencies as possible

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• How do I change the "Default" password

  - by Allwar

  hi, here's my problem. When I log in I'm beeing asked for a password connecting to the internet which is strange because I'm the only user and the admin. I have auto log in and it never asks for passwords, (except when i do administrative tasks.) I have looked in the menu (System -- preferences, but i can't find any topic that say's passwords or similar. the only place where I have found a way to change my password is my user ((System -- preferences -- user and groups). I did try to take screenshots but nothing happened, which also is strange. I'm running ubuntu 10.04 LTS Desktop on my Asus 1201n (12").

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• Why does 'quickly package' fail with "An error has occurred when creating debian packaging"?

  - by slashcrack

  I've got a big problem with packing my quickly application for the Ubuntu App Showdown. When I try to package or submit my application, I get some warnings: quickly package ........ ---------------------------------- WARNING: syntax errors in facebook/FacebookWindow.py: encoding declaration in Unicode string (FacebookWindow.py, line 0) WARNING: the following files are not recognized by DistUtilsExtra.auto: AUTHORS~ facebook/AboutFacebookDialog.py~ facebook/FacebookWindow.py~ facebook/PreferencesFacebookDialog.py~ facebook/__init__.py~ facebook_lib/AboutDialog.py~ facebook_lib/Builder.py~ facebook_lib/PreferencesDialog.py~ facebook_lib/Window.py~ facebook_lib/__init__.py~ facebook_lib/facebookconfig.py~ facebook_lib/helpers.py~ setup.py~ ---------------------------------- An error has occurred when creating debian packaging ERROR: can't create or update ubuntu package ERROR: package command failed Aborting What does the second warning mean? How do I solve those warnings? I want to submit my app to the Ubuntu App developer Showdown into my PPA and it doesn't work. Thanks for any answer.

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• Build My Own Advertising Network

  - by clifgray

  I have a few ideas that I think would be pretty game changing for online advertising and I would like to build my own network but I don't know where to start. I know it will take a lot of time for major publishers to get on board but I am more curious about the technical side. What language/database model and framework are modern ad networks built on? Basically I want to build an advertising network that registers views per page and allows publishers to manage the look of their own ads and let's the users interact with the ads. Is there any good information on doing something like this or any framework you can suggest to build on? I know this would get complicated pretty fast so if you have suggestions for ad networks that let you customize them heavily I would be glad to hear your suggestions.

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• Unity: Render 2D textures on a 3D object's face

  - by www.Sillitoy.com

  I am not familiar with 3D graphics and I'd like to know what is the right way to render some 2D figures on different points of a wider face of a 3D object. My 3D object is just a cube representing a poker table. I have 2D png for players placeholders and I'd like to render these figures on the 3D object where needed. An alternative solution would be to render the whole face with a big picture containing all the placeholders figures. However it would be a waste of memory and thus less efficient. What do you suggest me?

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• Next steps for Asp.Net C# developer (RoR vs Python Django vs PhP Drupal)

  - by ProfessorB

  A majority of my web development experience has been on the .Net stack (mainly Asp.net C#). I am looking to learn something new in my spare time, for the use of personal projects and possibly for use professionally (as an ISV). I know some Python, done some scripting with it in the past, nothing on the web though. Php has been around for a long time and RoR has gained a lot of popularity. Are there any developers from the .NET world that have migrated over to one or more of the other platforms? If so, which do you prefer and why? Which would you suggest and why?

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• Why is my content database so large?

  - by PeterBrunone

  If your SharePoint site collection hasn't grown, but your content database has, the most likely culprit is versioning.  If a list -- or worse, a library -- has versioning enabled, the default is to keep every single one.  That means that every time someone edits and checks in a document, its storage footprint increases by the size of the document (and probably a little more).The solution?  It could be a bit painful, but you'll need to go back into each library and restrict the number of versions to keep (three is sufficient for most uses, but your needs may vary).  I suggest keeping only major versions as well, since minor versions are really just stopping points on the way to a published document.Of course if you have a real business need to keep all those versions around, then you'll want to look into an archiving solution that will take the old versions out of the content database but still make them available if necessary.

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• What are the complications involved in this startup:Payments through authorization of fingerprints?

  - by jim859

  I want to make a mobile application where by people can send payments by authorization of finger prints. An email id will be registered and their finger print(unique for everyone) will be stored on our server.Person A and Person B are already registered and have installed the app.A and B deposit some money through our app from their credit card. When a person(Person A) want to send money to other people(person B), person B will ask person A to authorize his/her finger print on person B's mobile.The finger print will be retrieved from our servers and the payment will be made to person B. Person A will open the app (later or at that time) and confirm that yes he/she has authorized his/her finger print for the transaction.If person A has actually done the transaction,no problem.If person A has unknowingly or forcibly and opts that he/she has not authorized his/her finger print,money will be deducted from person B's account. What are the problems/vulnerabilities here,how can it be solved. Any other ways you can suggest to facilitate the transaction

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• Various crashes in 12.04 after upgrade and fresh install

  - by stefan

  Ubuntu drives me crazy. Since I upgraded from 11.10 64-bit to 12.04 Ubuntu crashes regularly. One time the crash report tells me that Skype is the faulty app, another time it was Opera, and today the crash report tells me Xorg crashes. I read that it can be caused by a faulty upgrade so I made a clean new installation of 12.04 32-bit. But the error is the same. I had a look in the log files with a friend but we did not find a answer. This morning the crashes happened like this: Boot Auto-start Thunderbird Start VLC for radio Start Opera Working a while (30 minutes) Starting Skype 2 minutes later, the system freezes, the monitor turns black, a login screen appears and I enter my password. The desktop comes up again and the crash report pops up.

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• Determining an application's dependencies

  - by gpuguy

  I have developed an application using Windows Forms in C++ (IDE MS VC++ 2010). Some parts of the application also use MFC, and OpenCV. I want to send the application to my cleint for interim testing on his own machine. I have not developed any installer for the application, so I will be sending him an .EXE file. I want the client to not face any difficulties in replicating the environment, and therefore not lose any time. Can somebody suggest me what software (such as MS VC++ Runtime, .NET Framework, Windows SDK, etc.) should be installed on the client's machine for successfull testing of the application? Note: The OS (Windows 7) and hardware are exactly the same on both sides.

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• What server-side language should I learn to be able to start big user-input websites (like twitter, facebook, stackexchange...)?

  - by DarkLightA

  I'm thinking ASP.NET, but I don't really know. Can someone tell me what a good server-side language for the "Zuckerberg-dorm-room-starting-up-a-huge-website" deal? I know the latter used PHP, but as I've understood it that's kind of outdated and C#/ASP.NET is a better way to go about it. Is HTML + CSS + JavaScript + C#/ASP.NET MVC + MySQL a good combination for it? Is MySQL combined in ASP.NET MVC? Also, where's a good tutorial for the server-side language you suggest? As mentioned previously it has to be able to handle massive user-input without much fuss.

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• Missing feature in Hyper-V from Virtual PC

  - by Kevin Shyr

  One thing I really miss is the ability to create shared folder between host and guest.  Virtual PC does this well, you can create Shared Folder to be used every time, or just this one.  I have read some posts on how to do this.  Some people suggest using ISO Creator to package up the files and mount the image to DVD drive, but what I need is truly a "shared" environment, so I'm currently looking into creating Virtual switch and creating an internal network between the host and guest.  Let's see how that works out. I would have loved to give Virtual SAN Manager a try, but I don't have a local Fibre Channel to set one up. I guess this might be an extension to my original post:  http://geekswithblogs.net/LifeLongTechie/archive/2011/05/05/windows-virtual-pc-vs.-hyper-v-virtual-machines-vs.-windows-virtual.aspx

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• Good Compression for Slow-mo Video

  - by marienbad

  What's the best way to deliver super slow-motion video to the browser? This seems to me to be a special case, because with super slow-mo video (such as 10,000 frames per second) the visual difference from frame to frame is minimal. As such, it's easy to compress highly. Please suggest codecs, as well as encoding software, backend software, software configuration tips, and services like youtube. My goal is to get about 100 frames of QVGA video to the browser in 500KB. By the way, remember that Radiohead In Rainbows site?

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• ETL Software Research Question

  - by WernerCD

  Where I work, we use an in-house ETL solution that's homegrown and has been around for 5-10 years. I'm still new to my data analysis job, but I was wondering about the ETL tools that are out there. This is a new area for me. My situation, and job, is basically digging in a set of databases (DB2, SQL2005, Citrix, Ancient Cobol Database with a SQL Wrapper on top, MySQL, etc). Gather the desired information. combine the different datasets into one set. output into a file of choice (CSV, Tab Separated, Pipe Separated, XLS, etc). FTP to customer. I guess what my real question is, given my job, what are some good ETL suites that I can look at and compare to my in-house tools? This is more to research some other options. Ultimately, I'd either suggest a new solution or get options/ideas to improve our current app.

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• /dev/sda2 contains a filesystem with error after partitioning

  - by Private

  I just wanted to create a separate home partition on my Ubuntu 12.10 system. I booted the liveDVD, resized the sda2 partition (28gb of data resized to 30gb based on MiB [originally on a 100gb partition]) and made a new ext4 partition for the home folder. The drive is an SSD drive. I had changed the settings (noatime etc.) for SSD succesfully a week ago. On reboot I get the following error: /dev/sda2 contains a filesystem with errors Inode 74669 has an invalid extent node (blk 6881289) fsd / [953] terminated with status 4 What would you suggest me to do? If I can avoid a clean install that would save me a lot of time (I had just done all the config). I was following this HOWTO, but I did not get to changing any of the files or configs other than those with gparted. I have a (two-week old) SSD Samsung drive which is functioning just fine (other specs see bottom of this question). Other specs: 64bit 12.10, i7, 8gb ram, nvidia.

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• xrandr shows VGA1 as disconnected

  - by Felix

  I have a Thinkpad W520 with Nvidia Optimus graphics. I have disabled the Nvidia card in BIOS (by selecting "integrated graphics"), so I'm running only on the integrated Intel graphics. I get full 3D acceleration, which would suggest the drivers are properly installed. However, I'm not able to use an external monitor. With the external monitor connected and turned on, running xrandr always gives: $ xrandr Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 LVDS1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm 1920x1080 60.0*+ 59.9 50.0 1680x1050 60.0 59.9 1600x1024 60.2 1400x1050 60.0 1280x1024 60.0 1440x900 59.9 1280x960 60.0 1360x768 59.8 60.0 1152x864 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 disconnected (normal left inverted right x axis y axis) What gives? It sees the VGA1 port (to which the external display is connected), but it appears disconnected. I have tried forcing a resolution as per these instructions, but when I do that X becomes unresponsive and I have to Ctrl-Alt-F1 and restart it.

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• Nautilus left pane does not expand

  - by dn.usenet

  I would prefer the left pane of Nautilus to behave like Windows file manager. It should have expandable/collapsible trees, and if I have /home/mydir-1, /home/mydir-2, I should be able to see them both in the left pane. When I click on one of them, the files in that dir should show in the right pane. If Nautilus can't do it, please suggest a better file-manager which does. I would rather not open 3 panes in Nautilus to do what two panes do just fine in Windows File Manager. Secondly how can I open two instances of Nautilus? And if it isn't possible with Nautilus, could it be done with some other file manager?

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• disk not accessible

  - by user107044

  i formatted my hard drive yesterday and it was working well even after the formatting. But when I restarted my system again , is is showing that the space is alloted to my files but they are inaccessible. I have even tried to unhide the files and folders, if they got hidden somehow. But nothing works. the hard drive is being shown empty but the properties are saying that it still conatins the data : http://imgur.com/ObjTE in the image, it is showing that the directory has only 1 file of size:4.8 kbps but the space being used by the drive is 11.6 GB. do suggest some solution.

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• Nautilus menubar behind top panel ubuntu 11.10

  - by pst007x

  The nautilus menubar appears behind the top taskbar, I have tried to uninstall appmenu-gtk3 and restart nautilus as suggested but no joy. There is a duplicate but it is closed with no proper solution, disabling nautilus is not a solution! Thanks all Note: Not resolvable, it is a bug, wait for an official fix! A fresh install corrected the problem. The only work around is to disable Nautilus as your desktop manager. I suggest the easiest way is to use gnome-tweak-tool found in the repos. Thanks all

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• I have Ubuntu 11.10 and for no apparent reason my sidebar suddenly will not hide, how can I reverse this?

  - by cathy

  I have Ubuntu 11.10 and for no apparent reason my sidebar suddenly will not hide, I did not go into system settings or anything like that. I googled this, but everything I found had me downloading something to be able to fix it. However, as it changed without me downloading anything, I'm hoping it's possible to change it back without downloading anything. I read somewhere that I should go into "System setting", "appearance", "behaviour" and change it to "auto-hide", but I did not have a "behaviour" tab in "appearance". I would normally be able to just deal with it, but it is preventing me from being able to click the "back" button when I am in a browser. Does anyone

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• Ad networks that will serve via HTTPS?

  - by Dogweather

  I've built a website with 160K page views per month that serves every page over HTTPS. The recent FireSheep news will probably increase the adoption of "HTTPS everywhere" but it's been very hard to find ad networks and affiliates that will serve their content via HTTPS. I don't want to use these because I don't want my visitors to get "broken security" notification from their browsers (and of course, relevant ads would be a leak of private information). I'm tired of spending a ton of time signing up with ad networks and affiliates only to find out down the road that they don't support HTTPS (e.g. AdSense). Can anyone suggest any options or provide a pointer to a list of these somewhere?

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• Develop JavaScript API to expose web services [closed]

  - by Apps

  We are planning to develop a JavaScript API to expose some of our J2EE based services. We are doing this keeping Google Maps API in mind. Can someone please suggested where we should start and the approaches that we need to follow to create a useful and extensible JavaScript API? These are the things that we are considering to achieve. It should be very simple for others to use our API. We feel Google Maps API is like that. We should be able to release the updates of the APIs without affecting the existing implementations. We should have enough security measures so that not all can use these services. Please suggest us if there are any books that can guide us through. Any suggestion will be greatly helpful for us. Please let me know if my question is not clear or you need any further information.

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• 24h dans la vie d'Internet, une infographie réalisée par de jeunes chercheurs et designers dévoile des chiffres surprenants

  24h dans la vie d'Internet Une infographie réalisée par de jeunes chercheurs et designers dévoile des chiffres surprenants Jen Rhee et l'équipe du site MBA Online (le site d'auto-formation et de conseil qu'il a créé) ont réalisé une infographie pour le moins surprenante. Ils se sont intéressés à ce qui se passe sur Internet en l'espace d'une simple journée. Et les chiffres révélés sont à la fois étonnants et amusants. On y apprend par exemple qu'en une journée, les flux d'informations échangés sur Internet pourraient remplir 168 millions de DVD. Que près de 294 milliards d'e-mails sont envoyés (l'équivalent de deux années de traitement de courrier aux Etats-Unis). Ou que 2 millions d'articles de ...

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• Is it practically useful to decline GUI for a newbie in Ubuntu?

  - by Kifsif

  My Ubuntu is 12.04. I have just started learning Linux and Ubuntu in particular. To remember commands quicker, I'd like to decline GUI. But there are some problems. I don't know where installed programs are to launch them. For example, I have a pdf file. I know that there is a program to view such files. Should it be the case of GUI, I would just click on the pdf-file, and have a look that I use Document Viewer 3.4.0. Then I would like to launch Firefox Web Browser. Even if I know it is installed, how to find the file to be launched using just CLI is a mystery to me. Could you suggest me anything.

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• doing a full permutation search and replace on a string

  - by user73307

  I'm writing an app that does something like a custom number (licence) place generator tool where if I ask for the plate "robin" it will suggest I try: r0bin rob1n r0b1n Are there any published algorithms which can do this? It has to be able to handle replacing single letters with multiples, e.g. m with rn and vise-versa and not fall over if it replaces an i with an l then comes to check the l and replaces it back to an i. The list of what gets swapped with what is going to be user input but I'm not expecting a huge list, possibly 10 pairs at most. I'll be implementing this in Ruby or Python but I should be able to convert code from any other language.

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