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This question already has an answer here:

On Ubuntu 12.04, how can I find out

  • when an application was installed and
  • when the applications/libraries it depends on are installed/upgraded/updated?

My Okular doesn't work any more. I guess it might be because something it depends on has been upgraded.

marked as duplicate by slm, jasonwryan, manatwork, derobert, Thomas Nyman Apr 22 '14 at 6:23

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.

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    Look at /var/log/apt/history.log for history of installations/removals using apt. – Faheem Mitha Apr 21 '14 at 18:14