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• Wireless internet sharing stops working after client disconnects

  - by Mandy

  I'm running Unbuntu 11.10 with the latest service packs, sharing an ether connection over wireless. Everything works fine, up to the point that the client (a laptop) sleeps or otherwise disconnects. The wireless connection at that point no longer functions, not showing up when searching for the hotspot with the laptop. The only way to recover is to reboot the machine, or toggle the wireless share off/on. I've double checked the wireless card has power management off. Currently what I'm doing is keeping an Ipod plugged into the box 24/7 to keep the wireless connection up when the laptop disconnects. I've searched the internet far and wide, found many issues with wireless problems after an ubuntu box itself sleeps, but nothing directly related to my problem. Hoping someone has some idea of where to look and what to check. A girl needs her Ipod back!

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• Mentioning a price for a service behind a free app in App Store

  - by David

  We are making a business service and have created an app to be used as a front-end. The app is free, but the service is not. Due to Apple taking 30% of in-app purchases, our service cannot be bought as an in-app purchase. My question is: Could Apple choose to throw out our app if we mention the price of the service in the description of our app in iTunes or in a help-text in the app? It seems unreasonable that this would cause problems, but the potential consequences to our business could be terrible so I want to make sure.

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• Installer says I'd need a wireless firmware, but WLAN works without it out of the box

  - by unor

  While installing 12.04.01 (Alternate) on a netbook (Samsung N150Plus), Ubuntu informed me that I'd need the firmware brcm/bcm43xx-0.fw. I skipped this step. If I understand this page correctly, the mentioned firmware is a WLAN driver. However, after the Ubuntu installation was completed, the WLAN worked out of the box. After a few minutes, Ubuntu informed me that there is a firmware update available, which would be the mentioned firmware. Do I need to install this? Is Ubuntu using some kind of "lite" WLAN driver and I might run into problems with certain networks in the future, if I don't use the firmware? Would there be benefits in using the firmware? (maybe longer runtime because of lower consumption?)

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• cannot run c compiled programs. if you meant to cross compile use --host' Ubuntu

  - by Ali.A

  I'm completely new to Ubuntu I downloaded and unpacked a tar.gz package, after extraction, it is said in its documentation : "type ./configure --disable-gts" But when i run this command alone it tells me "Permission Denied" error. Then i tried to use "sh ./configure --disable-gts" insted, but this time i faced this error: configure: error: cannot run C compiled programs. If you meant to cross compile, use `--host'. How can i overcome these two problems? (I mean permission and compile error) I'm just a rookie and i need urgent help. Thanx

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• Project Euler 20: (Iron)Python

  - by Ben Griswold

  In my attempt to learn (Iron)Python out in the open, here’s my solution for Project Euler Problem 20.  As always, any feedback is welcome. # Euler 20 # http://projecteuler.net/index.php?section=problems&id=20 # n! means n x (n - 1) x ... x 3 x 2 x 1 # Find the sum of digits in 100! import time start = time.time() def factorial(n): if n == 0: return 1 else: return n * factorial(n-1) print sum([int(i) for i in str(factorial(100))]) print "Elapsed Time:", (time.time() - start) * 1000, "millisecs" a=raw_input('Press return to continue')

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• Unable to use TL-WN821N

  - by udiw

  Hi, I got a TP-LINK USB wireless module - TL-WN821N, using Ubuntu 10.4 (same problems were also seen in 10.10). From everything I've read online, the usb should work just fine, since the Atheros ar9170 is built into the kernel. However, when I plug it in, it is detected as a USB device, but there is no wlan associated with it, and basically - nothing happens. Am I doing something wrong? what should I do so that the Atheros driver is associated with this device? btw, on Windows it works fine (with the drivers). Some logs: $ uname -mr 2.6.32-28-generic i686 $ lsb_release -d Description: Ubuntu 10.04.2 LTS $ lsusb ... (trimmed) Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 017: ID 0cf3:7015 Atheros Communications, Inc. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub $ lsmod |grep ar9 ar9170usb 51296 0 ath 7611 1 ar9170usb mac80211 205402 3 ar9170usb,iwl3945,iwlcore cfg80211 126528 5 ar9170usb,ath,iwl3945,iwlcore,mac80211 led_class 2864 4 ar9170usb,iwl3945,iwlcore,sdhci

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• How do I deal with code of bad quality contributed by a third party?

  - by lindelof

  I've recently been promoted into managing one of our most important projects. Most of the code in this project has been written by a partner of ours, not by ourselves. The code in question is of very questionable quality. Code duplication, global variables, 6-page long functions, hungarian notation, you name it. And it's in C. I want to do something about this problem, but I have very little leverage on our partner, especially since the code, for all its problems, "just works, doesn't it?". To make things worse, we're now nearing the end of this project and must ship soon. Our partner has committed a certain number of person-hours to this project and will not put in more hours. I would very much appreciate any advice or pointers you could give me on how to deal with this situation.

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• After installing mysqli phpmyadmin stop loading

  - by phreakbox

  On Linux host 3.2.0-30-generic #48-Ubuntu SMP Fri Aug 24 16:52:48 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux phpmyadmin won't load after installing mysqlnd. I'm using php5, mysql AND mysqlnd. Maybe mysql and mysqlnd conflicts for phpmyadmin. Problem: If I remove mysqlnd (mysqli support), PHP5 not working with mysqli, PHP5 only works with mysql. (Results for tests: function_exists('mysqli_fetch_all') return FALSE. That's ok. If I installed mysqlnd, php5-mysqlnd, PHP works with mysql + mysqli sumulately. Problems affected after mysqlnd install: After installing mysqli (mysqlnd) support, phpmyadmin won't load. Works PHP5 mysql + mysqlnd. When installing once again phpmyadmin than mysqlnd won't load. PHP PDO and mysql only works.

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• How much help should I give during technical interviews?

  - by kojiro

  I'm asked to perform or sit in during many technical interviews. We ask logic questions and simple programming problems that the interviewee is expected to be able to solve on paper. (I would rather they have access to a keyboard, but that is a problem for another time.) Sometimes I sense that people do know how to approach a problem, but they are hung up by nervousness or some second-guessing of the question (they aren't intended to be trick questions). I've never heard my boss give any help or hints. He just thanks the interviewee for the response (no matter how good or bad it is) and moves on to the next question or problem. But I know something about the rabbit hole that defeat and nerves can lead you down, and how it disables your mind, and I can't help wondering if providing a little help now and then would ultimately help us end up with more capable programmers instead of more failed interviews. Should I provide hints and assistance for befuddled interviewees (and if so, how far should I go while still being fair to the more prepared candidates)?

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• How can I factor momentum into my space sim?

  - by Josh Petite

  I am trying my hand at creating a simple 2d physics engine right now, and I'm running into some problems figuring out how to incorporate momentum into movement of a spaceship. If I am moving in a given direction at a certain velocity, I am able to currently update the position of my ship easily (Position += Direction * Velocity). However, if the ship rotates at all, and I recalculate the direction (based on the new angle the ship is facing), and accelerate in that direction, how can I take momentum into account to alter the "line" that the ship travels? Currently the ship changes direction instantaneously and continues at its current velocity in that new direction when I press the thrust button. I want it to be a more gradual turning motion so as to give the impression that the ship itself has some mass. If there is already a nice post on this topic I apologize, but nothing came up in my searches. Let me know if any more information is needed, but I'm hoping someone can easily tell me how I can throw mass * velocity into my game loop update.

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• Write own messaging system vs. utilize existing ones

  - by A.Rashad

  We are trying to have our own startup, with a middleware application to glue small applications with enterprise legacy systems. for such middle-ware to function properly, we will need some sort of messaging system to make different components talk to each other in a reliable way. the alternatives are: use an existing messaging system, such as 0MQ, jBOSS, WebSphere MQ, etc. build our own messaging system the way we see the problem I am more biased towards the later option for the following reasons: to have more control over our final product to avoid any licensing problems later on to learn about messaging while writing the code to invent something new, that might cost us lots of $$$ if reused an existing system What would you do if in my shoes?

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• Unable to re-install compizconfig-settings-manager

  - by Killmoves

  While attempting to fix a problem with compiz settings manager, I got an idea from someone to purge compiz - sudo apt-get purge compiz. The compiz core packages are still intact however, the gui compizconfig-settings-manager is deleted and missing from synaptic. If I try to install through terminal I get: The following packages have unmet dependencies: compizconfig-settings-manager:i386 : Depends: python-compizconfig:i386 but it is not going to be installed Depends: python-gtk2:i386 but it is not going to be installed E: Unable to correct problems, you have held broken packages Any suggestions or insight is appreciated. Thanks.

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• Any really decent way to get three monitors?

  - by JohnCC

  What satisfactory solutions are there to achieve three monitors on Ubuntu? I know some ATI cards (Eyefinity) can support 3 monitors from a single card, but I don't know how well this is supported under Linux and besides, I've never had much luck with ATI on Linux. The alternative is to try two cards, but there seem to be problems there too. It looks to me like xrandr cannot support 2 GPUs. I believe you'll end up with two separate "Screens" across which you cannot move applications or windows, unless you enable Xinerama which as I understand it disables some acceleration and probably compositing too. I've found so much conflicting information on this online, I'm really confused. Please advise!

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• What are QUICK interview questions for the Microsoft stack development jobs?

  - by Dubmun

  I'm looking for your best "quick answer" technical interview questions. We are a 100% Microsoft shop and do the majority of our development on the ASP.NET web stack in C# and have a custom SOA framework also written in C#. We use a combination of Web Forms, MVC, Web Services, WCF, Entity Framework, SQL Server, TSQL, jQuery, LINQ, and TFS in a SCRUM environment. We are currently on .NET 3.5 with a very near transition to .NET 4.0. Our interviewing process includes a 55 minute interview with two technical people (usually an architect and a senior developer). The two interviewers have to share the time for questions. That isn't enough time for very many true programming problems so I'm looking for more good questions that have quick, yet meaningful, answers. We are mainly interviewing for Senior Dev positions right now but may interview for some Juniors in the future. Please help?

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• What is the benefit of writing to a temp location, And then copying it to the intended destination?

  - by Devdatta Tengshe

  I am writing an application that works with satellite Images, and my boss asked me to look at some of the commercial application, and see how they behave. I found a strange behavior and then as I was looking, I found it in other standard applications as well. These Programs first write to the temp folder, and then copy it to the intended destination. Example: 7zip first extracts to the temp folder, and then copies the extracted data to the location that you had asked it to extract the data to. I see several problems with this approach: 1.The temp folder might not have enough space, while the intended location might have that much space. 2.If it is a large file, it can take a non-negligible amount of time for the copy operation. I thought about it a lot, but I couldn't see one single positive point to doing this. Am I missing something, or is there a real benefit to doing this?

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• Cannot install nodejs and npm

  - by user809829

  I'm trying to install nodejs and npm, however, it fails. This is my terminal: sudo apt-get install nodejs npm Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: nodejs : Conflicts: npm E: Unable to correct problems, you have held broken packages. What to do? I'm kinda lost :(

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• Project Euler 1: (Iron)Python

  - by Ben Griswold

  In my attempt to learn (Iron)Python out in the open, here’s my solution for Project Euler Problem 1.  As always, any feedback is welcome. # Euler 1 # http://projecteuler.net/index.php?section=problems&amp;id=1 # If we list all the natural numbers below 10 that are # multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of # these multiples is 23. Find the sum of all the multiples # of 3 or 5 below 1000. import time start = time.time() print sum([x for x in range(1000) if x % 3== 0 or x % 5== 0]) print "Elapsed Time:", (time.time() - start) * 1000, "millisecs" a=raw_input('Press return to continue') # Also cool def constraint(x): return x % 3 == 0 or x % 5 == 0 print sum(filter(constraint, range(1000)))

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• Installing windows after ubuntu is installed (need to create ntfs partition too)

  - by Brent Roose

  I prefer Ubuntu to work on, but for some applications for school, I need windows. I've done some research and have a few problems: I only have one hard drive which is formatted as ext4, not ntfs. Many people say I have to use Gparted to create an ntfs partition to install windows on, the only problem is that I need to unmount my drive to do this, which isn't possible I think because I only have one. I thought about mounting my HDD as a slave on a windows laptop but I don't manage to partition it with windows partition manager, so I think I need some kind of tool. which one? next problem I'll probably have is that I won't be able to boot ubuntu after installing windows because grub will be removed from my MBR. are there any good guides around here? I've used some kind of tool before, but it crashed my whole HDD so I had to fully format it.

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• Cannot install vim

  - by Max Popp

  I am running ubuntu 11.10, as xubuntu, in an amd64 pc, configured as dual boot with win7 . I tried installing vim with this: sudo apt-get install vim I got these error message: "The following packages have unmet dependencies: vim : Depends: vim-common (= 2:7.3.154+hg~74503f6ee649-2ubuntu2) but 2:7.3.154+hg~74503f6ee649-2ubuntu3 is to be installed E: Unable to correct problems, you have held broken packages." I only have a very faint idea of what the problem is, and none whatsoever on how to correct this. Hope you guys can help. Thanks

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• Lenovo Y460 Shutdown/Reboot/Logoff doesn't work

  - by ultimatebuster

  This is a part of the massive dump of problems I'm encountering with my Lenovo Y460 and Ubuntu. Problem: Cannot shutdown/reboot/logoff. Logoff issue: http://ubuntuforums.org/showthread.php?t=1791439 Shutdown and Reboot often freezes without doing anything. Currently can only use hard reset. Maybe related to the tricks I did to work around the ATI/Intel issue. See: Lenovo Y460 ATI PowerXpress issue I'm not sure where I can find the shutdown/reboot logs. If you tell me I'll be happy to provide them. Not sure what to do as of right now other than never shutdown/reboot or logoff

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• Example: Controlling randomizer using code contracts

  - by DigiMortal

  One cool addition to Visual Studio 2010 is support for code contracts. Code contracts make sure that all conditions under what method is supposed to run correctly are met. Those who are familiar with unit tests will find code contracts easy to use. In this posting I will show you simple example about static contract checking (example solution is included). To try out code contracts you need at least Visual Studio 2010 Standard Edition. Also you need code contracts package. You can download package from DevLabs Code Contracts page. NB! Speakers, you can use the example solution in your presentations as long as you mention me and this blog in your sessions. Solution has readme.txt file that gives you steps to go through when presenting solution in sessions. This blog posting is companion posting for Visual Studio solution referred below. As an example let’s look at the following class. public class Randomizer {     public static int GetRandomFromRange(int min, int max)     {         var rnd = new Random();         return rnd.Next(min, max);     }       public static int GetRandomFromRangeContracted(int min, int max)     {         Contract.Requires(min < max, "Min must be less than max");           var rnd = new Random();         return rnd.Next(min, max);     } } GetRandomFromRange() method returns results without any checking. GetRandomFromRangeContracted() uses one code contract that makes sure that minimum value is less than maximum value. Now let’s run the following code. class Program {     static void Main(string[] args)     {         var random1 = Randomizer.GetRandomFromRange(0, 9);         Console.WriteLine("Random 1: " + random1);           var random2 = Randomizer.GetRandomFromRange(1, 1);         Console.WriteLine("Random 2: " + random2);           var random3 = Randomizer.GetRandomFromRangeContracted(5, 5);         Console.WriteLine("Random 3: " + random3);           Console.WriteLine(" ");         Console.WriteLine("Press any key to exit ...");         Console.ReadKey();     } } As we have not turned on support for code contracts the code runs without any problems and we get no warnings by Visual Studio that something is wrong. Now let’s turn on static checking for code contracts. As you can see then code still compiles without any errors but Visual Studio warns you about possible problems with contracts. Click on image to see it at original size.  When we open Error list and run our application we get the following output to errors list. Note that these messages are not shown immediately. There is little delay between application starting and appearance of these messages. So wait couple of seconds before going out of your mind. Click on image to see it at original size.  If you look at these warnings you can see that warnings show you illegal calls and also contracts against what they are going. Third warning points to GetRandomFromRange() method and shows that there should be also problem that can be detected by contract. Download Code Contracts example VS2010 solution | 30KB

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• Xubuntu 14.04 will not boot after preseed installation

  - by Christian

  I recently set up Xubuntu 14.04 installation using preseed, and ran into a couple of problems during boot time. At first, right after the installation completed during first boot the system complained about /tmp not being mounted and did not proceed any further. I was able to fix that problem by making an entry for /tmp in /etc/fstab like so: tmpfs /tmp tmpfs optional,nodev,nosuid 0 0 This worked for a while (and still does for workstations that are already running), but newly installed machines are broken. They do not complain like before, but take forever to boot (2h) and it seems the root partition is mounted read only and you cannot do anything useful with the system. Any ideas on what to do? You can find the presseed file here Thanks in advance Update: If I get it to boot once via some magic in rescue mode (like simply mounting the root partition read-write, then resume boot) it will work forever. While this is a workaround, it is no option to do this for every installation.

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• LGPL License in commercial application

  - by Jacob

  I have searched around but I don't seem to be able to get a clear answer on my questions that I understand. I want to use the Xuggler library in my application, which is licensed either GPL or LGPL depending on whether I compile it myself. I don't intend to edit the library If I compile it myself and thus get a LGPL version of the library, can I use it in a commercial application without having to distribute the source code of my application? Furthermore, do I have to give my application the LGPL license as well? What other problems might using this library give me?

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• To branch or not to branch?

  - by Idsa

  Till recently my development workflow was the following: Get the feature from product owner Make a branch (if feature is more than 1 day) Implement it in a branch Merge changes from main branch to my branch (to reduce conflicts during backward merging) Merge my branch back to main branch Sometimes there were problems with merging, but in general I liked it. But recently I see more and more followers of idea to not make branches as it makes more difficult to practice continuous integration, continuous delivery, etc. And it sounds especially funny from people with distributed VCS background who were talking so much about great merging implementations of Git, Mercurial, etc. So the question is should we use branches nowadays?

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• Boot path not found, cannot start OS

  - by Dustin

  My desktop is 12.04 64bit, and it cannot boot from the hard drive anymore. When I attempt to it just is stuck on a blank screen with an blinking dash, and nothing happens. I checked with the bios trouble shoot for problems and it said that no boot path could be found. I do not know why this is happening, but need to fix it because it used to boot up normally. What I need to know is how to fix it. I can boot into a live DVD. Also, there were a few boots I would attempt to boot into a live USB, then it would boot to the hard drive, but that does not work any more. So with the live DVD (it is an 10.04 LTS 32bit), is there any means to correct the boot path from the live DVD? Thank you for your time and answers.

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