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• Architecting persistence (and other internal systems). Interfaces, composition, pure inheritance or centralization?

  - by Vandell

  Suppose that you need to implement persistence, I think that you're generally limited to four options (correct me if I'm wrong, please) Each persistant class: Should implement an interface (IPersistent) Contains a 'persist-me' object that is a specialized object (or class) that's made only to be used the class that contains it. Inherit from Persistent (a base class) Or you can create a gigantic class (or package) called Database and make your persistence logic there. What are the advantages and problems that can come from each of one? In a small (5kloc) and algorithmically (or organisationally) simple app what is probably the best option?

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• Issues running alongside windows and connecting to wireless network

  - by user292247

  Okay so I'm trying to get started with ubuntu but I'm encountering a couple problems: When I boot up the CD and try to install, it does not recognize that I have windows 7 installed and just sees it as unallocated space so the only way I've been able to install it is by wiping the drive which was fine, but it'd be nice to be able to boot either. And secondly, I cannot figure out how to get wireless working. When I try to connect on the initial installation process it tells me to connect to my adapter and just asks for a password. I suspect it could be a driver issue but I wouldn't know where to find it. I have an AR9485 atheros adapter and am attempting to run ubuntu 14.04. Thanks

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• Which Linux OS should I use?

  - by dylan0005

  I have use Ubuntu 10.04 & 12.04 but my problem is disk space, I just have 4GB of HDD! awesome considering all hardware that exists nowadays! Notebook Asus eeePC 900 with 2Gb of ram, intel inside CPU. So, which is the best OS should I use? I need one that have no problems with compatibily also that's not be so old. I've tried some of lightly versions like Puppy, slax, LPS us army OS, Precise.... BUT I don't like any of them. What do you think about Debian or Linux Mint?

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• nvidia-package in 12.10 somehow not same like in 12.04 resp. X-lib not complete?

  - by dschinn1001

  Not knowing if this has to do with new kernel-update automatic done by ubuntu 12.10 ? it seems that kernel 3.2 in 12.04 has not these problems with nvidia-drivers ? I tried to install the actual google-earth as deb-package with dpkg -i it seems to be no problem, but when I type command: google-earth in terminal, there comes up the report among else: Xlib: extension "NV-GLX" missing on display ":0". Xlib is installed completely and nvidia-driver is de-installed (then reboot) then re-installed again. the report of google-earth stays the same: Xlib: extension "NV-GLX" missing on display ":0". ubuntu 12.04 was working quite good with google-earth. however: bumblebee seems to be taken out of program ? ( or needs to be re-edited ? ) Don't hurry too quick with solution, I can wait !

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• how to avoid workaholic tag

  - by Shirish11

  As we all know a programmer just needs a computer and a network connection. When these things are available at your disposal you can program anywhere in the world. Now this is causing me a bit of problems. Since its not necessary to work at your workplace only you are asked anytime of your vacation or week-off to help out the client on reported bug. Also if you do enjoy doing it at your pass time, any one seeing you stare at the computer may treat you workaholic which I don't enjoy. How do you make them realize that its not just about the work.It can be a hobby also. In my understanding a workaholic is a person who works to earn but an enthusiast is the one who works to learn.

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• I have reinstalled 12.04 and there is no dual boot option

  - by JuP

  Tonight, I have reinstalled Ubuntu 12.4on Win XP pro machine for a 3rd time. (Uninstalled in between.) Oddly enough, this machine had a dual boot between xp pro & ubuntu for several months before we decided to reinstall everything (because of windows). Have you had any problems with the reboot on XP Pro SP3 with all updates & microsoft essentials? I am not getting a choice of which operating system to boot into, it just boots into windows & does not acknowledge ubuntu!

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• Can I redirect the HTTP request towards an old folder to the homepage using .htaccess file?

  - by AndreaNobili

  I have to following situation: I had an old blog that was made using Joomla (this blog was indexed well enough by search engines). For some problems I delete it and I have create it again using WordPress. Now I have many visit (from Google) that leading to specific pages of the old site (pages that don't exist in the new version). For example I have visit to URL as: /scorejava/index.php/corso-spring-mvc/1-test that don't exist on my new site. I would know if using the .htaccess file (or other sistem) I can redirect the HTTP request directed to some subfolder (that don't exist in the new version) to the homepage of my new site. For example I have the request towards the void URL: /scorejava/index.php/corso-spring-mvc/1-test. And I would create a regular expression that say something like: all the request toward the subfolder corso-spring-mvc (and all it's content file and subfolder) have to be redirected to www.scorejava.com. Is it possible?

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• Why are the proposed BADSIG (on apt-get update) fixes secure?

  - by EvanED

  I'm running apt-get update, and I see errors like W: GPG error: http://us.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <[email protected]> It's not hard to find instructions on how to fix these problems, for instance by asking for the new keys with apt-key adv --recv-keys or rebuilding the cache; so I'm not asking about how to fix these. But why is this the right thing to do? Why is "oh, I need new keys? Cool, go get new keys" not just defeating the purpose of having a signed repository in the first place? Are the keys signed by a master key that apt-key checks? Should we be doing some additional validation to ensure that we're getting legitimate keys?

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• Where can I post software challenges and offer prizes as a way to outsource some work?

  - by r0u1i

  My apologies if this is off-topic, I thought this question suits this site better than stackoverflow. We have a few rather small and bounded problems in my company that we would love to outsource. Since they are very similar to challenges ("prove this and this can be done" rather than "supply the code"), we thought of posting them as challenges and offer prizes to the first guys who will crack them up. The outsourcing sites I know off (TopCoder, ODesk) are more interested in long term contracts with monthly pay. Is there a site better matching my needs out there?

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• Ubuntu won't stay installed

  - by tommythm227

  I recently experienced OS problems with Windows 8 so I decided to wipe my hard drive and install Ubuntu using a usb boot. I am able to "Try Ubuntu" or choose to install instantly, however, after installation it asks me to restart my computer but when I do this I receive the same installation options I originally had, "Try Ubuntu", "Install", "OEM Install", "Repair Disk". I initially thought this was the result of leaving the boot usb in, so I tried reinstalling, but now I just receive a message saying "No boot disc or boot disc failed". This happens with any type of install I do, I've tried clearing the hard drive multiple times, making a new boot usb, but nothing seems to help. I've tried reinstalling windows, but I encounter the same problem, without the usb I get an error. I have an Acer Aspire M3470, I cleared my hard drive and attempting to install via usb boot. I have a weird BIOS menu probably because of AMD but it's been hard to find information regarding my particular BIOS menu. HERE is an image of my BIOS menu

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• programs becoming unresponsive

  - by Alex

  I have changed from Mint 13 to Ubuntu, complete fresh install. However I regularly get programs becoming unresponsive seems to be more after when switching between screens or work places. eg before i was using firefox have 2 pop up screens(no junk ones) bank login and an ebay chat, switching between them and then firefox faded to grey and I had to force close as it become unresponsive. Ubuntu is very nice to use, but I never had these problems using mint 13. Is this common, are there any fixes coming??

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• Sharing between new install and Windows 7 boxes not working, either direction. Printers & folders

  - by Steve

  I don't seem to be able to share between my Ubuntu (fresh install) and any of my Windows machines. I tried using this guide: How to Share Folders in Ubuntu & Access them from Windows 7. The problems is that I cannot see the Ubuntu machine in my network pane on the Windows machine. Any Ideas of what I should check? Ultimately what I am looking to do is make mobile media server that I can put in the Van, attach a WiFi router, and stream to an iPad, tablet, laptop, etc. Any advice on setting this up would be appreciated.

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• Alternative Web model

  - by Above The Gods

  One of the problems web apps have against native apps, especially on the mobile front, is the constant need to re-download each web page on request. Ultimately, this leads to slower performance. Why if web apps only download new pages if they're actually needed, not because they're simply requested. For example: perhaps the server can store a web page version in a cookie. Every slight change to the page on the server-side changes the version number. Now instead of the browser requesting a new page each time, why not just check the version number and have the server send the page if they're different? If the page similar, the user can just use a cached page. I'm sure browsers doesn't necessarily have to change to accommodate changes to this, correct?

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• Firefox installed on my ubuntu 12.04 machine but I am unable to connect to the internet(Nobody know???)

  - by Chella

  every other browser installed is working fine..! except this Firefox. what are the things that I need to check, to make firefox work on my computer. I am a newbie for ubuntu. I tried googling not got enough and clear information. Please help me. Thanks in advance..! This is the error that I am getting just before launching of the application..! Could not initialize the application's security component. The most likely cause is problems with files in your application's profile directory. Please check that this directory has no read/write restrictions and your hard disk is not full or close to full. It is recommended that you exit the application and fix the problem. If you continue to use this session, you might see incorrect application behaviour when accessing security features.

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• Is it possible to lose some directories when upgrading from 11.10 to 12.04?

  - by maythux

  Last day I upgraded my Ubuntu 11.10 desktop to Ubuntu 12.04. I was running a KVM virtual about 7 machines and managed by virt-manage software. Anyway when I finished upgrading I found that virt-manager is not working. So I had to reconfigure it again and install some other missing packages that was deleted! Eventually, I managed to solve this issue. Then I started to restore my virtual machines. I restored 2 machines without any problems. The third and fourth ones (Windows) made a check disk that lasted more that 6 hours but finally it worked. Other machines I can't find their attached hard disks. I don't know what happened but I can't find those files. Does upgrading delete files? Is there anyway to restore those files?

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• GitHub OS project how to have a good version and a work in progress version

  - by Para

  I have started my own OS application, I am hosting it on GitHub. My problem is that I push changes to the repository from more than one location so sometimes I want to work on it and sometimes I can't always finish something in time but I would still like to push it anyway so I can fetch it later from my other location. I'd like to be able to somehow have a stable version and have the master branch be a 'work in progress'. How do I do this? Is there some button I can push that will take the code from my master branch and make it into a zip file in my downloads tab and call it a version or should I do this by hand? Would it be better to have the master branch be nice and neat and have a separate branch to play with and then merge the two when the time is right? Would this not cause more problems in the merging phase?

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• Validation and Verification explanation (Boehm) - I cannot understand its point

  - by user970696

  Hopefully my last thread about V&V as I found the B.Boehm is text which I just do not understand well (likely my technical English is not that good). http://csse.usc.edu/csse/TECHRPTS/1979/usccse79-501/usccse79-501.pdf Basically he says that verification is about checking that products derived from requirements baseline must correspond to it and that deviation leads only to changes in these derived products (design, code). But he says it begins with design and ends with acceptance tests (you can check the V model inside). The thing is, I have accepted ISO12207 in terms of all testing is validation, yet it does not make any sense here. In order to be sure the product complies with requirements (acceptance test) I need to test it. Also it says that validation problems means that requirements are bad and needs to be changed - which does not happen with testing that testers do, who just checks correspondence with requirements.

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• Why does apt-get keep waiting for headers on Oracle repository?

  - by hughdbrown

  I have this at the end of my /etc/apt/sources.list to retrieve Oracle code: deb http://oss.oracle.com/debian unstable main non-free When I run sudo apt-get update, the app gets stuck displaying this message: 100% [Waiting for headers] If I remove this, apt-get update runs without error. Is there a new, recommended URL for Oracle products and, generally, how do you fix this problem? I am pretty sure this did not happen on 11.10 and has only started with the move to 12.04. I have seen these answers and they do not help: apt-get update stuck on "Waiting for Headers" http://ubuntuforums.org/showthread.php?t=1689579 http://muffinresearch.co.uk/archives/2010/03/30/linux-fix-for-apt-get-update-waiting-for-headers/ http://www.kubuntuforums.net/showthread.php?57567-Ubuntu-problems-on-update

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• Google Hangouts plugin is not working as I want in Chromium

  - by r00n

  Am I the only one experiencing problems with the Google Hangouts plugin? I did some changes so that I see the Hangouts icon in the topbar. But it happens once and a while that I cant open the window. The only thing I can do in that case is close Chromium and reopen it again. I have Hangouts with multiple people in the same chat. So Pidgin or Empathy is not something what I can count as workaround. Also when I closed the browser and want to reopen it I get the Contact List of Hangouts and not the Browser itself. I have to open it by using right-click on the Chromium shortcut.

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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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• Looking for parallel programming problem

  - by Chris Lieb

  I am trying to come up with a problem that is easily solvable in a parallel manner and that requires communication between threads for a test. I also am trying to avoid problems that require require random waits, which rules out dining philosophers and producer-consumer (bounded buffer), two of the classics. My goal is for the student to be able to write the program in less than 20-30 minutes in front of a computer not knowing of the problem beforehand. (This is to prevent preparation more than to come up with something novel.) I am trying to stress the communication aspect of the program, though the multi-threaded nature is also important. Does anyone have some ideas? Edit: I'm using Google Go for the language and testing comprehension of the goroutines/channels combo vs an actors library that I authored.

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• What is ethical/unethical while seeking help on the web with programming assignments?

  - by HelpNeeder

  I have used the web and Stack Overflow extensively during the past month or so in creating my final project for my C# class. I have used so much code that I didn't write myself that I feel I am being unethical by not giving proper credit to the people who helped me; or the websites that have provided excellent examples. Is it unethical to publish work which was created by me, even though its hardest problems were solved by other people? Should I credit these people for helping me with my assignment? Or the web sites which provided examples?

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• kubuntu 12.04 runs slowly

  - by randy

  i have a 3ghz amd 64 dual core am3 socket processor, asus mom board, 4GB ram, 8800GTS nividia video card with 500MB ram. installed kubuntu 12.04 and very laggy. select menu and 20 seconds later the menu pops up. i switched to classic menu and that seemed to help. what direction should i look first to get this running better? video perhaps? i had ubuntu 11.04 on this machine previously and had no problems with speed.

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• Triple Monitor Setup with Nvidia and Compiz

  - by AndrewX192

  I have a triple monitor setup with two video cards on Ubuntu 10.04. I have the monitors and graphics cards currently setup as follows: Nvidia Geforce 210 #1 - 1920x1080 Monitor (Twinview) [Center - Monitor #1] - 1920x1080 Monitor (Twinview) [Right - Monitor #2] Nvidia Geforce 210 #2 - 1920x1080 Monitor (Separate X Screen) [Left - Monitor #3] This works fine, except when I open a program, it shows up in between monitor #1 and #2 - meaning I have to drag it to one screen before I can use the window. Gnome2's gnome-panel also does not work on the twinview setup; it spans between both monitors, but it does not redraw (ex: the clock never changes). In addition, when I maximize an application, it spans both monitors, which is not acceptable. When I enable Xinerama for my setup, gnome-panel no longer spans two monitors, and applications maximize as expected, but compiz does not work, as X11 compositing is not available. The lack of desktop compositing causes problems with dragging windows between screens (redraws take forever). Is there anything I can do to fix these issues without opting for different graphics cards?

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• How to install Radeon X600 driver

  - by mmrs151

  I am completely new to Ubuntu and now running into so many problems regarding my display. I will be so grateful to the community to help me out and keep me loving Ubuntu. When I run lspci | grep VGA I get the following output 01:00.0 VGA compatible controller: ATI Technologies Inc RV380 [Radeon X600 (PCIE)] I am not sure if it means the driver is installed. Now the problem is I can not change the resolution like I can do in windows. I wanted to use dual monitor but it can not detect dual monitor. The monitor option in the preference shows 'Unknown' I tried to use a VGA switch for my ps3 and computer, but the computer is stuck with 1024x768 resolution. I have been trying for last three days, couldn't figure out anything. Now asking for you wisdom to get my display work. Regards, MMRAHMAN

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