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A few days ago I tried to upgrade from 12.10 to 13.04 but in the middle of the upgrade my computer shut down due to power problems in my house. After I booted my computer again there was a problem with broken packages so I repaired them using the repair mode in the grub menu. This all worked fine and I was able to update again, but after these updates I can't open update-manager anymore and a lot of features don't work anymore.

Can someone help me please?

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Please tell us what error message(s) you get when you run sudo apt-get update in a terminal window (press CTRL + ALT + T to open a terminal). –  Clive van Hilten May 26 '13 at 17:14
    
When I do this, it doesn't give any error, but I can't open update-manager and when I open 'about this computer'it doesn't say 'update' anymore in the lower right corner. I can't control my sound either and the icon of several apps like updatemanager and files changed. –  Kielstra May 26 '13 at 18:06
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You may have scrambled the Ubuntu version, in sources. Do you get an error if you run sudo apt-get upgrade (after sudo apt-get update)? –  david6 May 27 '13 at 8:40

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