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Since I upgraded to Precise 12.04, I've been having troubles with Unity3d, as my graphics card drivers don't seem to work. I've tried reinstalling them, downgrading them, and reinstalling unity. Whenever I try to do so, it won't let me, saying:

The following packages have unmet dependencies:
 gnome-tweak-tool : Depends: gnome-shell but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Does anyone know how to solve the broken packages problem? I've looked everywhere and I'm desperate. Thank you for your attention.

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marked as duplicate by Seth, vasa1, Thomas W., Kevin Bowen, Eliah Kagan Mar 20 '13 at 5:57

This question was marked as an exact duplicate of an existing question.

possible duplicated: How do I resolve unmet dependencies? – Lucio Mar 19 '13 at 18:31

The Debian release notes include some good instructions on disabling holds.

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Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Eliah Kagan Mar 19 '13 at 19:30

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