[Ubuntu Wiki] Update of "Bugs/FindRightPackage" by shankao

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The "Bugs/FindRightPackage" page has been changed by shankao:
http://wiki.ubuntu.com/Bugs/FindRightPackage?action=diff&rev1=130&rev2=131

  
   * `notify-osd` in Ubuntu, Xubuntu and Edubuntu
  
+ Lock screen problems:
+ 
+  * If your problem is with the lock screen itself, the package is gnome-screensaver until 13.10 or unity from 14.04 onwards. For more info, check https://wiki.ubuntu.com/DebuggingScreenLocking/HowScreenLockingWorks
+ 
  === Printing ===
  
  All printing in Ubuntu is done via the Common UNIX Printing System (CUPS). The package is `cups`. (See also [[DebuggingPrintingProblems]].)