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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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ALTERNATIVES TO UBUNTU SOFTWARE-CENTER

Software-center is a graphical interface for package management in Ubuntu. There are many alternatives to the Ubuntu software-center. 1. APPGRID: Appgrid is a lightweight alternative to Ubuntu software-center. It will also allow you to purchase applications. You can install it in Ubuntu with these following commands: sudo add-apt-repository ppa:appgrid/stable sudo apt-get update sudo apt-get install appgrid 2. LUBUNTU SOFTWARE-CENTER:  Lubuntu software-center is another alternative to Ubuntu software-center. The Lubuntu Software Center lets you browse and install thousands of applications available for Lubuntu. You can view available applications by category, or search quickly by name or description. You can also examine the applications already installed, and remove those you no longer need. You can install it by using the following command: sudo apt-get install lubuntu-software-center 3. DEEPIN SOFTWARE-CENTER: You can install deepin software-center by using the following command...
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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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