Unable to repair packages in Ubuntu Software Center
Solution 1:
Open a terminal and use these commands
sudo apt-get install -f
sudo dpkg --configure -a
sudo apt-get update && sudo apt-get upgrade
After the last one you should be able to open your USC
again without faults.
Edit
Comments explain that key 5A9A06AEF9CB8DB0 is missing, during sudo apt-get update
this fault comes up:
W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A9A06AEF9CB8DB0
To repair the key these commands can be used:
sudo gpg --keyserver keyserver.ubuntu.com --recv-keys 5A9A06AEF9CB8DB0
sudo gpg --export --armor 5A9A06AEF9CB8DB0 | sudo apt-key add -
After that sudo apt-get update
should work, if you get no faults on it you can open USC
again and click on the repair button.