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For a while I have the problem mentioned in the title. Update is stuck on pre-configuring packages without any other error. I tried almost everything I've found searching Google, but it didn't solve my problem.


sudo apt-get update
sudo apt-get autoclean
sudo apt-get clean
sudo apt-get autoremove
sudo apt-get update && sudo apt-get upgrade

is not working. Can somebody please help me fix this issue?

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I noticed that a mysql process was starting every time I tried to upgrade and it was eating all of one of my processors. That same process stopped after I stopped the upgrade process. I was unable to determine the cause of that mysql process being stuck so I followed the advice from here: MySQL fails to start after upgrade to 12.04?.

Then, after running apt-get upgrade it worked without a problem.

Hope this helps.

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