I have encountered this error several times lately on both Ubuntu Server/Desktop. E: Couldn't find package. I am trying to install the GUI desktop on the server 10.10
closed as too localized by James♦ Feb 28 '12 at 13:17
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Make sure the information of the packages is downloaded correctly. On commandline this can be done with
In the GUI package-managers, I believe should be an option like update packages or something like that, which does the same.