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I recently upgraded from 11.10 to 12.04 LTS, however due to time restrictions, I had to skip the step where outdated packages are removed. Is there a way for me to easily do this after the whole upgrade process has been completed?

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Can you please try the answer at this question (or by doing this search) and see if it helps? If it does, you should flag or delete this one as a duplicate. Good luck. – Tom Brossman Apr 30 '12 at 20:35
up vote 0 down vote accepted

I don't know whether this will do it but you could try, in a terminal:

sudo apt-get autoremove

It should not do any harm.

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