Looks like you have some custom PPA's installed, you will need to remove those
and their packages before you continue. Consider the tool 'ppa-purge' to do
this. I am closing this report, but please feel free to continue leaving
comments here.
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** Changed in: update-manager (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/931621
Title:
update-manager fail upgrade to 12.04
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