Ubuntu 13.10, I have added test repo and upgraded system. Now not everything is working correctly. How to revert packages to official release versions?
I've added many PPAs using the add-apt-repository command. Is there a simple way to remove these PPAs? I've checked in /etc/apt/sources.list for the appropriate deb lines but they aren't there.   This is on a server system so a command line solution would be great!
Cannot mount NTFS partition in Ubuntu 13.04 After I installed Ubuntu 13.04, I can't mount my NTFS partition.  Error mounting /dev/sda5 at /media/mrxfly/xFLyDiskData: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177" "/dev/sda5" "/media/mrxfly/xFLyDiskData"' exited with non-zero exit status 14: The disk contains an unclean file system (0, 0). Metadata kept in Windows cache, refused to mount. Failed to mount '/dev/sda5': Operation not permitted The NTFS partition is in an unsafe state. Please resume and shutdown Windows fully (no hibernation or fast restarting), or mount the volume read-only with the 'ro' mount option. Why are polymorphic values not inferred in Haskell? I have to travel to Germany and Switzerland for business purpose. I have already been here 2 years ago. I have applied for business visa to the German consulate twice and both times the application got rejected. They have put a green stamp on the last page twice. The reason is the purpose and information submitted regarding intended stay is not reliable. I have submitted the documents to Swiss consulate and they have accepted and granted me a visa. Now I have to first travel to Germany and then to Switzerland.  So my question is, with a Schengen business visa granted by Switzerland, may I enter in Germany? Does the rejection stamp has any impact for entering at German airport ? Does it mean I cannot travel to Germany but to other Schengen countries ? How can I get the values of the parameters of a calling method? Question  I'm writing some code that needs to be able to get the values of the parameters from the method that called into the class. I know how to get all the way to the ParameterInfo[] array, but I don't know how to then get the values. Is this even possible?  If it is, I think it has something to do with using the MethodBody property from the MethodInfo object, which allows you to inspect the IL stream, including properties, but I don't know how to do it, and I haven't found applicable code on Google.  Code  // Finds calling method from class that called into this one public class SomeClass {     public static void FindMethod()     {         for (int i = 1; i &lt; frameCount; i++)         {             var frame = new StackFrame(i);             var methodInfo = frame.GetMethod();             if (methodInfo.DeclaringType != this.GetType())             {                 string methodName = frame.GetMethod().Name;                 var paramInfos = methodInfo.GetParameters();                  // Now what?? How do I get the values from the paramInfos                  break;             }             else if (i == frameCount - 1)             {                 throw new TransportException("Couldn't find method name");             }         }     } } How to execute a program or call a system command from Python Slit screen and wave-particle duality Show that the Sorgenfrey line does not have a countable basis. Stack Exchange's heavy reliance on external scripts I was wondering if it is possible for you to make a command block spawn hostile mobs in random places in a specified area?   I need the mobs spawned on different Y coordinates too because you need to fight your way up a tower to the top and I want the mobs to vary on each level to have specialty to each floor every time you play the mini game. How can I setup a Material in Cycles for Z-Transparency? Run a batch file in a completely hidden way I'm looking for some way to run a batch file (.bat) without anything visible to the user (no window, no taskbar name, .etc..).  I don't want to use some program to do that, I'm looking for something cleaner. I've found  that uses VBScript, but I don't really like using VBS, either. The following methods can be used to add CSS for specific versions of IE:   Paste the code into html.tpl.php:  &lt;!--[if lt IE 9]&gt;&lt;link type="text/css" rel="stylesheet" src="/sites/all/themes/mytheme/less/ie.css"&gt;&lt;![endif]--&gt; Make use of the plugin  Use drupal_add_css() function   I have always used option #1 above, and adding yet another plugin for something so simple seemed crazy. BUT working with LESS and calling in statically means the file does not get processed by the LESS pre-processor, so the question:  How do you include a stylesheet using drupal_add_css() for specific versions of IE? Do black holes have a moment of inertia? My question is in the title: Do black holes have a moment of inertia?  I would say that it is: $$I ~\propto~ M R_S^2,$$ where $R_S$ is the Schwarzschild radius, but I cannot find anything in the literature. Should flagging a question for closure prevent close-voting? Back in April, I flagged a post as "not a real question".  The post was subsequently closed and reopened, then closed again and finally just reopened a 2nd time a short time ago.  I still firmly believe the post is not acceptable for SO, so I went to use my recently acquired close vote privilege and was greeted with the following messsage:    I specifically clicked close and not flag (and figuring I just clicked in error, I tried again and got the same message).  I do understand that, in the new closing system, flagging for closure is treated very much like a close vote (since it throws it to the close vote queue) except no vote is actually recorded.  My issue is why should by flag be counted as a close vote when I never actually voted to close. Recommended books for advanced undergraduate electrodynamics What's the difference between the server version and the desktop version? What's the difference between the server version of Ubuntu and the desktop version? I'm trying to set an alias for sudo !! in Bash. I tried alias sbb='sudo !!', but it interprets that as a literal  !! and prints   sudo: !!: command not found   If I use double quotes, it substitutes the double bang in the string itself, so that doesn't work.  Is there any way to make this work? Or an alternative alias? ` Why do elementary matrix operations not affect the row space of a given matrix? Which is correct, "neither is" or "neither are"? Prove $e^x - e^y \leq e |x-y|$ for $x$ belonging to $[0,1]$ I'm not sure how to go about this. Does it involve using MVT?  I got as far as saying $e = \frac{e^x - e^y}{x-y}$.