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When I open up the Software Center it gives me, "Items cannot be installed or removed until package catalog is repaired". Can someone help me?

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did you try sudo apt-get update from the terminal before installing applications from the Ubuntu Software Center – nitstorm Oct 16 '11 at 16:25

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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.

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Still doesn't work. It gives me the same error in USC – lieudusty Oct 16 '11 at 18:46
Do you get any faults at all during sudo apt-get update? Do a sudo apt-get clean and try those steps again. – Bruno Pereira♦ Oct 16 '11 at 19:07
On sudo apt-get update I got: inline 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, – lieudusty Oct 16 '11 at 19:09
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys followed by sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5A9A06AEF9CB8DB0 will do it for you I think (you have to type the 2 commands not only the last). – Bruno Pereira♦ Oct 16 '11 at 19:13
I did that and i still get the same error in USC. – lieudusty Oct 16 '11 at 19:15
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