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Possible Duplicate:
How do I resolve unmet dependencies?

An error occurred, please run package manager from the right-click menu or apt-get in terminal to see what is wrong.

The error message was:

'unknown error:'<type 'exceptions.system Error '>' ('E:The package tty-mscorefonts-installer needs to be reinstalled, but I can't find an archive for it.' this usually means that your installed packages have unmet dependencies
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marked as duplicate by Eliah Kagan, hhlp, Eric Carvalho, stephenmyall, Jorge Castro Jan 26 '13 at 20:27

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Your system's dependencies are broken. Fix it by just type following command in terminal. open terminal by pressing ctrl+alt+t or search Terminal in dash.

sudo apt-get install -f
sudo apt-get update
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