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The upgrade to "precise" was interrupted,and if I try to upgrade now,I get the message:"No upgrade possible with this tool"Where do I find the tool required to upgrade?

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2 Answers 2

Try this in a terminal:

sudo dpkg --configure -a
sudo apt-get -f install
sudo apt-get update && sudo apt-get upgrade
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Try to boot up a live CD and select the upgrade option at the main menu.

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Welcome to Ask Ubuntu! if you could add some more details to this answer, that'd be great. :) –  jrg May 11 '12 at 13:20

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