This question is in reference to another question that has not been answered. When I upgraded Ubuntu, all my PPAs were removed (which I'm ok with). Is there a way to list all the packages that no longer have a repository associated with them?
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APT refers to these packages as "obsolete".
Evidently there is no direct way to list these, but you could do:
aptitude search '~o'
Or alternatively:
apt-show-versions | grep 'No available version'
Source: How do I get a list of obsolete packages?
If you want a GUI tool you can do this with Synaptic by using the built-in "local or obsolete" filter.
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Really thanks for posting the Synaptic solution. For some reason, aptitude is not listing all of the packages without a repository. – Sepero Jul 04 '14 at 09:47