Ubuntu software center stuck in applying/canceling/searcing

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http://askubuntu.com – I can't install anything from software center because it is stuck at applying/searching, when i cancel it, it is stuck at canceling. Then software center gives me a pop up box that it needs to be repaired, so i click "repair" but in the progress of "repairing installed software" it is stuck at applying changes. Can somebody please help me? (HowTos)