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There is a task in "progress Tab" of the Ubuntu software center: "searching canceling". It is in an infinite loop and I can not remove it. Also, I can not install new software because it is waiting for the above task to end. ???

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What is the task? and how do you know it's an infinite loop? Some packages can take quite a while to be installed. – Dan Aug 13 '12 at 11:47
Since when & which package installation caused this , do a Reboot and try again. – atenz Aug 13 '12 at 12:57
Tried reboot, it's there foe a week... the package line just show: "Searching Cancelling" – Sem Aug 19 '12 at 9:48
Thanks, it was dropbox installation. It is fixed. – Sem Aug 19 '12 at 11:17

Kill Software Center and open it again. The broken task should die with it, and you can go back to using it normally.

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I tried in terminal: sudo killall apt-get It didn't help? – Sem Aug 19 '12 at 9:43
Thanks. It is fixed. – Sem Aug 19 '12 at 11:19

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