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I got the classic requires installation of unsupported packages. I was told to fix this with

sudo apt-get update && sudo apt-get upgrade

So I copy/pasted into the terminal, and it worked as normal. Then my cat walked on Alt+F4 (KDE4) and closed the window roughly 75% through the upgrade. I can no longer install non-tarball packages. I don't even have Alien.

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I also cannot try to update or upgrade – Xander Kyron Feb 27 '13 at 13:26
Please try apt-get -f install. Post the errors you got. – prophecy201 Feb 27 '13 at 13:31
Please at least post the solutions you've tried, this question is unanswerable without more detail! – Jorge Castro Feb 27 '13 at 14:46

This should fix it: sudo apt-get autoclean

Or sudo apt-get clean

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