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How do I resolve unmet package dependencies?

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PROBLEM: The most common problem that Ubuntu users face is unmet dependencies. 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:  package1 : Depends: package2 (>= 1.8) but 1.7.5-1ubuntu1 is to be installed E: Unable to correct problems, you have held broken packages. What can we do to resolve this: SOLUTIONS: If the error shows something like this: <some-package>: Depends: <other-package> (= version) but this-version is to be installed Then make sure that the restricted and universe repositories are enabled. Press  Alt+F2 , type software-properties-gtk and hit Enter or search for software & updates   in the dash. Under Ubuntu Software tab, enable all the repositories....
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What should I do when Ubuntu freezes!

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PROBLEM: All operating systems freeze some times and Ubuntu is no exception. What should I do when: A program stops responding? Nothing responds to mouse clicks or key presses? cursor stops moving entirely? What things can I try before hard rebooting the machine? SOLUTIONS: When a single program stops responding: When a single program stops responding mostly we can close it by clicking on the X  shaped close button on the top right corner of the window.We will get a dialog box saying that  the program is not responding and you may press force stop or wait for the application to respond. You can also kill an application using xkill. Press ALT +  F2 and type xkill and press Enter . Now the mouse cursor will turn into an X.  Click on the non responsive window to close it. When the mouse stops working: If the keyboard still works, press ALT + F2 and type gnome-teminal . From there you can start to troubleshoot things. If you want to try restarting the GUI run sudo s...
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ANTI-VIRUS FOR LINUX

Do I need to have an anti-virus software for Linux? Isn't Linux virus free? If it is virus free then why are some anti-virus software in the software-center? If you are an average user of Linux you might be having these questions. So, do we really need an anti-virus software installed? The answer is  'yes'  and ' no'.  Don't worry after reading this post you will know if you need an anti-virus for your Linux. There are viruses for most all platforms, they are just more common on Windows. You can actually run Windows without a virus scanner if you keep it patched and are really careful. If you are really careful and know what you are doing you can get away without a scanner. The fact of the matter is: viruses/worms take advantage of flaws or holes in the code. There are some viruses targeted on Linux platform. Linux and other UNIX platforms are regarded are well protected, but not immune to computer viruses.  It is said that Linux is not targeted because its low ...
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