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• My system screen goes black and displays Term Signal Killed?

  - by Quandite

  My computer will often just die randomly while I am using it. The screen goes black and sometimes displays the words TERM signal killed along with other things and sometimes it displays nothing. The writing stays on the screen momentarily before it disappears to just black. I then have to hold in the power button to turn it off and then re boot. Here are the specs... help! Ubuntu 10.04(lucid) Kernel Linux 2.6.32-23-generic GNOME 2.30.2 memory 495.7 MiB processor Intel(R) Pentium(R) 4CPU 1.80GHz

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• Why are downloads from Canonical Partners repository so slow?

  - by Sabacon

  If I need Sun Java, Adobe Flash Plugin or anything else that comes from Canonical Partners the package downloads are painfully slow even small sized packages like the Flash plugin, to speed things up I have to go here: http://archive.canonical.com/ubuntu/pool/partner/ to find what I want, download the packages with a download manager (which is usually about 20 times faster than the package manager) and then place them in my /var/cache/apt/archives folder I run the package manager afterwards, as long as the right versions of the packages I ask to install are detected in the /var/cache/apt/archives folder they will be installed immediately. I would like to stop doing this, so I am wondering if anyone else has this problem, what could be the cause and if there is a fix. I am located in the Western Caribbean region. I think it would be helpful to note that all other packages coming from the repository I have selected with synaptic download at acceptable speeds.

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• CS4326/7 sound chipset on Thinkpad 600E

  - by user7120

  OK, I know this has been a problem for a while, and I know by now this really old Pentium II laptop is really really really obsolete. However, I have installed Lubuntu 10.10 on this laptop and things seem to work fine except the sound. Now I've read and gone through a bunch of tutorials and guides to working around this, none of which have worked. I have gone through this Ubuntu bug report and that doesn't work either. The problem I think is that the latest workaround is (understandably) about two Ubuntu versions behind. Now I'm not sure what has changed since then to make that workaround not work, but I would appreciate any help. Thanks

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• Camera placement sphere for an always fully visible object

  - by BengtR

  Given an object: With the bounds [x, y, z, width, height, depth] And an orthographic projection [left, right, bottom, top, near, far] I want to determine the radius of a sphere which allows me to randomly place my camera on so that: The object is fully visible from all positions on this sphere The sphere radius is the smallest possible value while still satisfying 1. Assume the object is centered around the origin. How can I find this radius? I'm currently using sqrt(width^2 + height^2 + depth^2) but I'm not sure that's the correct value, as it doesn't take the camera into account. Thanks for any advice. I'm sorry for confusing a few things here. My comments below should clarify what I'm trying to do actually.

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• What is a good design pattern and terminology for decoupling output?

  - by User

  I have a program where I want to save some data record. And I want the output type to be flexible such that I could save the data record to a text file, xml file, database, push to a webservice. My take on it would be to create an interface such as DataStore with a Save() method, and the concrete subclasses such as TextFileDataStore, DatabaseDataStore, etc. What is the proper name/terminology for this type of pattern (I'm using the term "DataStore", log4net names things "appenders", .net they talk about "providers" and "persistence")? I want to come up with good class names (and method names) that fit with a convention if there is one. can you point me to a decent example, preferably in C#, C++, or java? Update Managed to find this stack overflow question, Object persistence terminology: 'repository' vs. 'store' vs. 'context' vs. 'retriever' vs. (…), which captures the terminology part of my question pretty well although there's not a decent answer yet.

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• How to Detect and Fix an Infected PC

  You may have noticed that your PC is not acting the way it used to when you first purchased it. If so, malware may be the culprit. Here are some ways to detect if your PC has been infected, as well as methods to correct any such problems to get things back to normal, as suggested by researcher Tim Armstrong of Kaspersky Lab. Malware Detection Irritating Popups Irritating popup windows are one of the telltale signs that your PC is infected with malware. One of the most common classes of malware driven popup windows comes in the form of scareware, or fake antivirus warnings. These popups tel...

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• At Symbol not working for apt get proxy authentication Ubuntu 11.10

  - by Shivhari

  I Have tried two things in three places to see if it works please do help me out. Two methords: 1) replacing @ with %40 2) replacing @ with \@ Three places: 1) export with the .bashrc file 2) editing /etc/apt/apt.conf and setting acquires there 3) using gconf editor and setting the values in /system/http_proxy and setting authentication name and password and checking the use_authentication checkbox. still there is no success and i still get 407 error when trying wget or apt-get update. please do help me, been stuck with this for three hours now. also, i read somewhere that creating a file in /etc/apt/apt.conf.d and then creating a 01proxy file with acquire might work. I tried that also, but it doesnt work. Please help.

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• What is the difference between all-static-methods and applying a singleton pattern?

  - by shahensha

  I am making a database to store information about the users of my website (I am using stuts2 and hence Java EE technology). For the database I'll be making a DBManager. Should I apply singleton pattern here or rather make all it's methods static? I will be using this DBManager for basic things like adding, deleting and updating User profiles. Along with it, I'll use for all other querying purposes, for instance to find out whether a username already exists and to get all users for administrative purposes and stuff like that. My questions What is the benefit of singleton pattern? Which thing is most apt here? All static methods or a singleton pattern? Please compare both of them. P.S. The database is bigger than this. Here I am talking only about the tables which I'll be using for storing User Information.

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• Ubuntu 14.04 + nvidia-331-updates makes a blank desktop screen

  - by Achint

  I upgraded my installation from 13.10 to 14.04. The problem is that whenever I install the Nvidia drivers from the GUI, upon reboot or trying to login again it only shows the wallpaper of my desktop and nothing else. The mouse does move around, but nothing works. I am unable to open a terminal or do anything else. If I go into the tty console and purge the drivers, then things seem to work again. I have an Optimus setup, with an onboard Intel and discrete Nvidia GTX770M card. It's a 64-bit architecture. I really need to work with CUDA, and was hopeful after hearing that nvidia-prime was released, but this is a real downer. Any help on this?

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• How to convince a non-technical client that their application spec needs to be simplified?

  - by Ryan

  Often times I am faced with the situation where a new client comes to me with an application that has literally 100s of unnecessary features and it is quite clear that things need to be drastically simplified for the project to have any chance of succeeding. How do you convince the client to take a more MVP approach and simplify? edit: So the current top answer is to provide the client with a time/cost estimate for the huge application. I'm not too fond of this answer because it doesn't address the real problem with this situation. And that is - it's a bad practice to spec out a massive application and then try and build it from the get go. I feel much more comfortable initially building a small, simple MVP foundation. And then adding small features to that foundation one by one. So how do I convince the client to approach building software in this way?

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• How do I turn off all the password prompts?

  - by Barkerto

  I've been using Ubuntu 12.04 LTS since release and am trying to figure out a couple things about all of these passwords and key-ring prompts that I've just been living with for a while. Ever since install it seems that every time I boot up my computer and want to do anything (ie. use the internet, use a internet browser, install something, delete something, pick my nose) I'm always prompted for either a normal password entry or a key-ring password entry. Is there anyway to turn off all of this "security" and tell my Ubuntu that it can trust what I'm doing and go take a shower? Thank You in advance, barkerto

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• Does it really takes 5-10 years (or more) to be really good in programming?

  - by Ygam

  I don't get it. Why is there such a notion that it takes this long to be really proficient in a single language? I somehow think that this statement meant that it takes such a long time to master your language, and use it in a lot of context (web programming, desktop applications, mobile applications, etc.). Adding to that, sometimes you get stuck on a single language in your job and doing repetitive things and don't have much time to study other languages, thus for a certain amount of time, you don't really do much learning at all, and that adds to the amount of time. What do you think?

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• Preseed Ubuntu installation with full disk encryption

  - by user249264

  I am trying to set up Ubuntu full disk encryption using preseeding. I was able to set things up correctly following the preseed file presented here. But I do not want to provide the default password in the preseed file. Is there a way to let ubiquity fall to the screen that asks for the encryption passphrase just like it does when the username is not provided in the preseed file? When I try to leave the passphrase option empty in the preseed file, I get an error in the installer saying "An error occured while creating the keyfile".

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• Why does the BADSIG/"Untrusted sources" error recur forever?

  - by Jeff McMahan

  On at least a dozen occasions, I've spent 2-3 hours figuring out how to get Ubuntu 11.10-12.10 to either update or acquire software from software center, or both. I want to fix whatever is causing the BADSIG problem once and for all; I've wasted so much time trying to get this to work well enough that I can rely on it, but the same problem comes back after a couple weeks of normal updates and software center usage. Don't refer me to a standard posted solution on the web---whatever it is, I've used it more times than you have. The question isn't whether I can get it to work right this afternoon. I can. The question is what is causing the problem to recur regularly across 3 releases. Notice: I use this computer 4-5 hours per week and I do little on it. PDFs, Latex, FireFox, Mendeley, and that's it. I don't constantly install new software, and I don't fiddle with things unnecessarily.

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• Upgrading an app to support iOS5, 6 and 7

  - by drekka

  We are looking at an app that needs an upgrade. Currently it runs on iOS4, 5 & 6. The upgrade will move to iOS5, 6 & 7. It will also involve some UI changes and new features. I've been reading stuff on iOS7 and looking at things like auto-layout. What we are trying to figure out is the best way to handle the differences between the various iOS versions. Auto-layout seems like a good idea, but it's not available on iOS 5. There are also API changes to consider between all 3 versions and other new features of iOS7. So the questions: How would you handle auto layout given iOS5 does not have it? Are there any significant differences between the SDKs that you think would cause issues? Would we be better off with separate code bases?

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• I need a backend system that is integrated with web services, is there an open source solution?

  - by Jarom

  I'm basically familiar with what I need in order to setup web services to talk with a centralized db, but if I don't have to go through and do all the work, I'd rather not. Is there an open source solution that would allow me to easily integrate web services for data transfer to a central db? I want to make a site that is powered by a db that can also be accessed by other things like mobile apps for example. What are the steps involved in setting up such a site? Any help is appreciated! I could use all the help I can get!

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• C# XNA render an entire frame to a texture2d

  - by redcodefinal

  I asked a question here: C# XNA Make rendered screen a texture2d But, I ended up not getting the exact result I was looking for since I didn't ask the question right. In a game I am writing, I render an extremely large city out of objects, this can cause lag when moving the camera to view things that are off screen. I need a way to render then ENTIRE city, even the stuff that is off screen, and make it into a Texture2D. The answer I chose for the last one didn't work entirely right because it only gets what is on screen, not what is off.

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• VS2010 tip: Cannot find the HttpUtility on .NET 4.0?

  Now that Visual Studio 2010 is here with more options and better colors, there are a few things that have changed a little and might confused you a bit. For example the good HttpUtility, if you are creating a Windows Console application or a Windows Service and you want to use that awesome class full of goodies, you would try to go to reference and add System.Web.dll, yet in the list that dll will be missing. So did they removed that dll in .NET 4? Not really, still there however there are not profiles...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Clarify the Single Responsibility Principle.

  - by dsimcha

  The Single Responsibility Principle states that a class should do one and only one thing. Some cases are pretty clear cut. Others, though, are difficult because what looks like "one thing" when viewed at a given level of abstraction may be multiple things when viewed at a lower level. I also fear that if the Single Responsibility Principle is honored at the lower levels, excessively decoupled, verbose ravioli code, where more lines are spent creating tiny classes for everything and plumbing information around than actually solving the problem at hand, can result. How would you describe what "one thing" means? What are some concrete signs that a class really does more than "one thing"?

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• 2D Topdown Shooter Mouse Movement

  - by Jarmo

  I'm trying to make a topdown 2D space game for my school project. I'm almost done but I just want to add a few little things to make the game more fun to play. if (keystate.IsKeyDown(Keys.W)) { vPlayerPos += Vector2.Normalize(new Vector2(Mouse.GetState().X - vPlayerPos.X, Mouse.GetState().Y - vPlayerPos.Y)) * 3; rPlayer.X = (int)vPlayerPos.X; rPlayer.Y = (int)vPlayerPos.Y; } if (keystate.IsKeyDown(Keys.S)) { vPlayerPos += Vector2.Normalize(new Vector2(Mouse.GetState().X - vPlayerPos.X, Mouse.GetState().Y - vPlayerPos.Y)) * -3; rPlayer.X = (int)vPlayerPos.X; rPlayer.Y = (int)vPlayerPos.Y; } This is what i use to move towards and away from my mouse crossair. I tried to make a somewhat similar function to make it strafe with "A" and "D". But for some reason I just couldn't get it done. Any thoughts?

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• Detecting pixels in a rotated Texture2D in XNA?

  - by PugWrath

  I know things similar to this have been posted, but I'm still trying to find a good solution... I'm drawing Texture2D objects on the ground in my game, and for Mouse-Over or targeting methods, I'm detecting whether or not the pixel in that Texture at the mouse position is Color.Transparent. This works perfectly when I do not rotate the texture, but I'd like to be able to rotate textures to add realism/variety. However, I either need to create a new Texture2D that is rotated at the correct angle so that I can detect its pixels, or I need to find some other method of detection... Any thoughts?

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• Game Development In C Only. Is it possible?

  - by Ishan Sharma

  I am a first year college student in India and want to make a small game as a this semester project. I am quite good at C and am learning it rapidly but I wanted to ask if developing a game entirely in C (no C++ or C#) I'd love to use these but for college projects, we have strict requirements of using only C. What I am looking for is a simple top view driving game. It won't have anything fancy and even the visual things will be powered by simple characters. For example, user controlled car can be represented by ¦ and edges of road by series of |'s. What do you think?

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• Progressbar patterns (Eclipse)

  - by JesperE

  I've struggled quite a bit with Eclipse and progress-monitors to try to have good progressbars which report useful progress information to the user. Inevitably the code gets cluttered with lots of things like if (monitor.isCancelled()) return; ... lengthyMethodCall(monitor.newChild(10)); and all over the place I need to pass a IProgressMonitor as an argument to my methods. This is bad, for several reasons: The code gets cluttered with lots of code which is not relevant to what the function actually does. I need to manually guesstimate which parts of the code takes time, and which parts do not. It interacts badly with automated tests; where much of the information which goes into a progressbar instead should be logged for later inspection. Is there a way out of this? Are there tools which can help me out with one or more of these problems? Should I be looking at Aspect-Oriented Programming tools, or are there other alternatives?

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• VMWare Player pauses often

  - by pascal

  I'm using a 64bit Windows 8 inside vmplayer, with 2 virtual processor cores, virtual hard disk resides on a fast local disc and is not preallocated; host CPU is Intel i7 3770, should be capable of hardware virtualisation but I don't know if VMWare uses it; NAT networking; Sound card connected, USB connected, accelerated 3D graphics (NVidia 313.30 on host) My problem is, that the VM often pauses for a few seconds, and then speeds up for a few seconds to reach real time again. Time in the VM actually moves faster after the pause, for example all animations using timers speed up. When running, the vmware-vmx process shows ~150% CPU usage in top, but 0% when pausing (and D state i.e. waiting for IO). iotop shows normal disk writes from vmware-vmx threads, but during pauses, the flush kernel thread uses 99%. Are there some options to try so that VMWare doesn't wait for IO? I've tried a few things available from the GUI but the issue never went away…

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• BIT of a Problem

  The BIT data type is an awkward fit for a SQL database. It doesn't have just two values, and it can do unexpected things in expressions. What is worse, it is a flag rather than a predicate, and so its overuse, along with bit masks, is a prime candidate for being listed as a 'SQL Code Smell'. Joe Celko makes the case. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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