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• issue with older laptops

  - by Adam

  I recently reimaged my Lenovo t400 with Ubuntu. However, after wiping two other systems (Compaq Presario 2100 and Dell Latitude D600) both hUbuntu 11.10 and Ubuntu 12.04 fail to load on boot. I am concerned that there is some type of issue using Ubuntu on these older systems as every part of the process has been repeated/attempted several times in the same manner as practiced in the successful load of the newer Lenovo t400. I now have two laptops without an operating system as the discs/thumb drives that were formatted to load on these devices do not seem to work. I would appreciate any assistance that you may be able to provide. Regards, -Adam

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• No sound in 12.04 on VirtualBox

  - by john crisp

  No sound when installed in VirtualBox. When I boot from the live CD in Windows, sound works fine on my speakers. When in boot the live CD in VirtualBox it does not see my speakers. In sound properties only digital output built in S/PDIF and headphones! I've done the pavcontrol - alsamixer - all settings are OK. I've tried both 32/64 versions of Ubuntu. Running current version VirtualBox. System: Windows 7 64 - i5. What am I overlooking?

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• Big problem: Complete computer crash (no response when booted)

  - by Feratile

  I need your help: I installed Ubuntu 12.04 on my computer (I removed the complete system and installed Ubuntu instead) It said that the bootloader installation failed. So I chose the only partition that existed again. Installation succesful. Restart your computer. I did this. Then it went black when it rebooted (only a flickering stroke appears). No ISOs are executable. BIOS Boot Device Priority says: 1st Boot Device [SATA:PM-SAMSUNG HM] That was all I can say, please help me!

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• DDD / Layers and legacy systems

  - by CSM

  I have to refactor a complex C# app (many dialogs, mixed logic and so on). There is a part managing the communication with special hardware equipments (sending commands and receive data via asynchronous c# callbacks). The code is "spaghetti" with mixed UI/Logic/Communication/etc and my task is to split the layers in a DDD sense. So, to which layer belongs a callback driver routine? The callbacks are creating "bubbles" in the system, up to the UI layer and because of this I cannot enforce the essential principle that any element of a layer depends only on other elements in the same layer or on elements of the layers "beneath" it. Thank you in advance.

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• No unity-greeter.conf file in /etc/lightdm/

  - by drofart

  I am running Ubuntu 12.04 with gnome-shell. I have two admin user accounts. Now, I used to know that in Precise we can set different different login wallpaper to different different user, so I tried with: sudo dbus-send --system --print-reply --dest=org.freedesktop.Accounts /org/freedesktop/Accounts/User1001 org.freedesktop.Accounts.User.SetBackgroundFile string:/usr/share/backgrounds/Green-wallpaper-27.jpg but to no avail. Then I tried sudo xhost +SI:localuser:lightdm sudo su lightdm -s /bin/bash gsettings set com.canonical.unity-greeter background '/path/to/the/wallpaper.png' It does change my login wallpaper but for all users. Then I tried to locate /etc/lightdm/unity-greeter.conf but I found that it is not there. So where is it and how can I set different login wallpapers for different users?

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• Images from remote source - is it possible or is it bad practice?

  - by user1620696

  I'm building a management system for websites and I had an idea related to image galleries. I'm not sure it's a good approach. Since image space needed is related to how many images a user might upload, I thought about using cloud services like DropBox, Mega, and Google Drive to store images and load then when needed. The obvious problem with this approach is that downloading the images from the 3rd party service would hamper the user experience due to the increased download times. Is there any way to save images belonging in an image gallery on remote source without hampering the user experience because of speed? Or is this approach really not a good practice?

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• What's the current best practice for C multithreading?

  - by Dexter

  I've been a Java (and PHP) developer for most of my life, but will need to use C for my next project. I remember some basic stuff we did back in school with fork, pthread, semaphores, etc. but I'm not sure if that's still the "way to go" here, or if there have been any recent developments/improvements etc. Google's results seem to be fairly dated. Or does that just mean that this is still the current "state of the art"? Or will I have to use a (system-independent) libary like glib if I want higher-level abstractions, like synchronized queues? What other libraries are there? (The programm will only have to run on Linux though)

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• Top 10 Transact-SQL Statements a SQL Server DBA Should Know

  Microsoft SQL Server is a feature rich database management system product, with an enormous number of T-SQL commands. With each feature supporting its own list of commands, it can be difficult to remember them all. MAK shares his top 10 T-SQL statements that a DBA should know. Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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• What are the common character animation techniques used in tile based hack&slash games?

  - by Gorky

  I wonder what kind of animation techniques are used for creature and character animation in modern hack&slash type tile based games? Keyframing for different actions may be one option. Skeletal framing may be another. But how about the physics? Or do they use a totally hybrid system of inverse kinematics supported with a skeleton,physics and mixed with interpolated keyframing for more realistic animations? If so, how and for what reasons? I can think of many different solutions for the issues below but I wonder what's used and best suited for issues like: Walking or moving on an uneven terrain Combat interaction, combat physics and collisions Attaching rigid items to character and their iteractions ih physics world Soft body dynamics like hair, vegetation, clothes and fabric in line with animations and iteractions.

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• how to make ext4 more reliable?

  - by amin

  hi dears as ext4 introduced more reliable than ext3 with block journals, is there any chance to suppose it 100% reliable? what if enabling block journaling on it, which is disabled by default? as friend's guide to explain my case in more detail: i have an embedded linux device, after installation keyboard and monitor is detached and it works standalone. my duty is to make sure it has reliable file-system so with errors there is no way to fsck on device. i can't force my customer to use a ups with each device to ensure no fault by power-failure. what can you offer me more than enabling block journaling? thanks in advance

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• How can I optimise ext4 for reliability?

  - by amin

  As ext4 was introduced as more reliable than ext3 with block journals, is there any chance to suppose it 100% reliable? What if enabling block journaling on it, which is disabled by default? As friend's guide to explain my case in more detail: I have an embedded linux device, after installation keyboard and monitor is detached and it works standalone. My duty is to make sure it has reliable file-system so with errors there is no way for manual correct faults on device. I can't force my customer to use a ups with each device to ensure no fault by power-failure. What more can ext4 offer me besides block journaling? Thanks in advance.

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• Problem in booting Windows Vista after repairing using a boot repair disk

  - by Pubudu

  Been using Vista and I recently installed Ubuntu 11 in a separate hard disk(in BIOS, this hard disk was set for the 'Boot from' option)..Apart from the partitions used for Ubuntu, there are 2 more partitions(NTFS) in that hard disk..Then I installed Windows 7 on one of those partitions (just to see which Windows operating system I'd like to keep on using, along with Ubuntu)..But after installing Windows 7, the OS selection menu didn't appear anymore and had to fix it using the Boot-Repair-Disk... It kinda worked.. Now the OS selection menu is displayed.. But whenever I select Vista, it boots Windows 7...any thoughts on how to fix this? here's the link to the log generated by boot repair http://paste.debian.net/202691 I'm new to Ubuntu btw..

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• Ubuntu One stuck and doing nothing

  - by Laurence Nagel

  Ubuntu One has worked fine for me for several weeks and I now have 8.2 GB of files in the clouds. Then, last night, Ubuntu One stopped working. When I fire up System > Preferences > Ubuntu One, it tells me that I have 8.2 GB stored (13.2 %) and that my status is Unknown. I've tried to restart to no avail. I even tried to remove, followed by clearing the password keyring and starting over. Still nothing. I've run out of buttons to push.

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• unzip can't work well?

  - by sgsheg

  Things like this, my friend send me a package named qcon.zip with his Mac pc. I use ubuntu system,when I use the command to unzip the folder,I found something was wrong.I check the permission,and use another soft named 7z,but it can't work now. when i use the command unzip qcon.zip unzip qcon.zip -d test/ it returns me that: unzip: cannot find or open ”-O, ”-O.zip or ”-O.ZIP. So after install 7z,the command I use , Error: qcon.zip: Can not open file as archive --add the command file--- file qcon.zip it returns qcon.zip: Zip archive data, at least v1.0 to extract So,what can I do now,the folder permission is right.

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• Is it normal for programmer to work on multiple projects simultaneously.

  - by gasan

  On a current job I have 2 projects to work on. First is very huge system and the second one is smaller but it also big (first project is being developed for 12 years, second for 4 years). At first I was working only on first project and was trying to get used to it. Then I was moved to second project and tried there, so my knowledge about first project became shady. Now I have to work on both projects at the same time. It's very hard for me because despite they both use java, they use different frameworks and the amount of code and business-logic to understand is very big so I really can't hold both that projects in my head. Is it normal and I should get used to it, although my expertise became very squashy, what won't happen if I would work only on a single project? Or should I raise a concern or maybe change employer?

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• How to disable automatic login?

  - by iammilind

  I was playing around with "User accounts" and somehow set automatic login. Now, when I start my PC, it just has one button named as "login". Clicking that button, directly logs me in to my PC. There is no music or no asking for password while logging in. As a side effect, it asks me separately for keyring password How to disable auto login and make login/keyring password unified again like before? NOTE: Attempting to disable Automatic Login from System Settings User Accounts does not work. This is the content of my /etc/lightdm/lightdm.conf (where I have commented the autologin for my username mgandhi): [SeatDefaults] greeter-session=unity-greeter user-session=ubuntu #autologin-user=mgandhi

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• Numbers on the launcher

  - by pete of ebor

  Using 12.04 LTS - few days ago, I left my machine on while I went out. On my return, the launcher was showing (it is set to be hidden) and there were small numbers 1-9 on the icons and letters s on the bottom-most icon and t on the rubbish bin. System still worked fine, although the launcher remained visible, and would not hide. After about 20 mins work, they suddenly vanished and the launcher hid itself.. is this a normal action ? It hasn't happened since..

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• Periodic updates of an object in Unity

  - by Blue

  I'm trying to make a collider appear every 1 second. But I can't get the code right. I tried enabling the collider in the Update function and putting a yield to make it update every second or so. But it's not working (it gives me an error: Update() cannot be a coroutine.) How would I fix this? Would I need a timer system to toggle the collider? var waitTime : float = 1; var trigger : boolean = false; function Update () { if(!trigger){ collider.enabled = false; yield WaitForSeconds(waitTime); } if(trigger){ collider.enabled = true; yield WaitForSeconds(waitTime); } } }

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• Lua and multi-paradigm programming: scope and capabilities

  - by Ef Es

  Despite having started learning programming with Pascal and C, after the jump to OO (C++, Java) I lost sense of the structured programming paradigm. I have started learning Lua and I have researched many tutorials, but all of them only cover basic operations and language features and capabilities. They feel more like a reference doc than a programmer's guide. Now, when trying to work with day to day tasks, how does one go through most common design patterns like observer, or multithreaded programming, creating UI elements and polling system calls for keyboard or sensors? Is it even feasible in this languages or you have to work with the C binding, libraries and low-level programming to get most stuff done? Do I get the Lua scope wrong?

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• Skype on 12.04 x64 does not start even after purging and reinstalling it

  - by Zevaka

  I am wondering if there's anyone here who managed to use Skype on 12.04. It used to work (ever since I first tried Ubuntu 10.04) flawlessly, but after upgrading to 12.04, it just doesn't start. If I start Skype from terminal, it just says Segmentation fault (core dumped). I tried to remove Skype and installed it from different locations: Skype website (did not install at all, "package error") From official Ubuntu repository (doesn't start at all, segmentation fault) From repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner" (doesn't start at all, segmentation fault) Interesting thing: even if I remove / purge Skype from the system, it still shows up in Unity menu (of course doesn't start). Any help here?

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• Just installed Ubuntu 12.04 - integrated speakers aren't working but headphones are

  - by Mat Elkan

  I've just installed Ubuntu 12.04 alongside Windows Vista. There were no previous versions of Ubuntu installed. My computer is a Sony Vaio all in one, with integrated sound card and speakers. I can't get any sound coming from the speakers, but if I plug headphones into the jack on the side of the computer and select "headphones" under "sound" in "system settings" I can get sound through them. I have been searching all day trying to find a fix but haven't had any luck. Any advice would be greatly appreciated. Thanks! Mat :-)

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• Find PublicKeyToken easily

  - by Sahil Malik

  SharePoint 2010 Training: more information This tip will make it easy for you to get that assembly name right within Visual Studio.This applies to both SP2010 and SP2007 or General .NET. In Visual Studio, Go to Tools –>  External Tools. Click on “Add” to add a tool, and put in the following values: Title: S&trong Name Command: Powershell.exe Arguments: -command "[System.Reflection.AssemblyName]::GetAssemblyName(\"$(TargetPath)\").FullName" Check “Use Output Window” Uncheck everything else – here’s how it should look - 3. That’s it, now in your project, Visit Tools –> Strong Name, and in the output window, itwill give you the assembly name like this –> SandBoxWebPartWithProxy, Version=1.0.0.0, Culture=neutral, PublicKeyToken=64b818b3ff69ccfa Read full article ....

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• How to make Classic ASP interesting if you are stuck with it?

  - by reno812

  I used to work on a really small outsourcing company (4 programmers and the boss), then when the stress and the frequent long shifts made the situation unbearable I made the switch to a better paid job with a more relaxed schedule that allows me some more free time. The problem, however, is that for the most part, everything is coded in Classic ASP that interfaces with a custom made C++ queueing system that stores everything in AS400 systems. My boss used to be one of the developers that made the initial efforts towards this, and naturally won't ever approve a switch to another languages / technologies despite the increasing difficulty that represents developing today business needs with yesterday tools. I'm pretty much stuck coding with Classic ASP in the foreseeable future, and I'm struggling to find ways to make it at least interesting, as I used to work with .NET and Java previously, and I feel like I'm going backwards... Any advice?

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• Reminder: For a Complete View Of Your Concurrent Processing Take A Look At The CP Analyzer!

  - by LuciaC

  For a complete view of your Concurrent Processing take a look at the CP Analyzer!  Doc ID 1411723.1 has the script to download and a 9 min video. The Concurrent Processing Analyzer is a Self-Service Health-Check script which reviews the overall Concurrent Processing Footprint, analyzes the current configurations and settings for the environment providing feedback and recommendations on Best Practices.This is a non-invasive script which provides recommended actions to be performed on the instance it was run on.  For production instances, always apply any changes to a recent clone to ensure an expected outcome. E-Business Applications Concurrent Processing Analyzer Overview E-Business Applications Concurrent Request Analysis E-Business Applications Concurrent Manager Analysis Identifies Concurrent System Setup and configurations Identifies and recommends Concurrent Best Practices Easy to add Tool for regular Concurrent Maintenance Execute Analysis anytime to compare trending from past outputs Feedback welcome!

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• How can I reduce the time taken to login by postponing/delaying some startup applications?

  - by koushik

  I have setup some applications to startup on each login (e.g., redshift-gtk, gtg) automatically but after adding these to startup applications (System -> Preferences -> Startup Applications) obviously the time taken to login has increased. Due to all this the time it takes for my panels, desktop etc to appear is too long - until which I am forced to wait. I don't need these apps to be available immediately, but it would be good if they startup eventually, meanwhile the ubuntu menu/panel is available for running other apps that I might need to. I tried using at command, with the intention of editing all startup applications to put the commands in the at queue, but this didn't work since the apps don't get the necessary environment variables (like DISPLAY). Is this what nice command is used for? Any other ideas how I can accomplish this? If possible, I would like to avoid editing the startup applications commands, since this would mean a lot of effort to replicate on other machines I use.

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