Broken packages after online upgrade from 11.10 to 12.04

[Dave Henley]

Yesterday I upgraded my ubuntu 11.10 online to version 12.04. During the upgrade a few messages came by stating the following:

The upgrade will continue but the 'firefox' package may not be in a working state. Please consider submitting a bug report about it.
subprocess installed post-installation script returned error exit status 2

Now I`m unable to perform any update/upgrade nor a new package install.
How to resolve this issue?

Dave
  		 	   		  
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