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I was trying to get musepack encoder support built into ffmpeg today, and I inadvertently broke a few things but I'm not sure exactly which package I installed which broke them. How can I remove ALL packages I installed today, and start again from scratch more carefully?

I can see a list of them in "Ubuntu Software Center" under today's date in the "History", but I don't want to go through uninstalling them one-by-one, because there are hundreds to do.

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up vote 4 down vote accepted

The file /var/log/apt/history.log has what you need. Take a look at the answer: How to reinstall many removed packages at once? it's a more detailed answer.

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