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I was upgrading my computer from Ubuntu 12.04 LTS to Ubuntu 14.04 LTS,but I turned off my computer during the upgrading, I fixed it so now it's completely back to 12.04. However, when I try to upgrade again, it says:

Check if you are using third party repositories. If so disable them, since they are a common source of problems.
Furthermore run the following command in a Terminal: apt-get install -f`

So now what do I do to upgrade it?

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It wants you to fix broken or missing packages before upgrade. In terminal run:

sudo apt-get -f install
sudo apt-get update
sudo apt-get autoclean
sudo apt-get upgrade
sudo apt-get dist-upgrade
  • autoclean is not necessary at that point, and you probably want dist-upgrade rather than upgrade. – thomasrutter Oct 12 '15 at 3:54
  • Thanks a lot now it doesn't says broken packages anymore :) Even thought I can't upgrade my computer... the hardware can't or something like that because I got this computer free from school so it's impossible to upgrade it :( – Emily Shan Oct 13 '15 at 11:52
  • There is nothing to stop a computer from upgrading that I know of. I would burn a copy of 14.04 to a bootable dvd from ubuntu.com/download/desktop. – DnrDevil Oct 13 '15 at 14:18
  • Im pretty sure it happens with my computer because I got it free from school, everyone has the same computer. Thanks for the link :) – Emily Shan Oct 13 '15 at 21:55

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