Can you do the following from the terminal:
$ sudo mv /etc/apt/sources.list /etc/apt/sources.list.bak
Then go into System ... Administration ... Software Sources and reselect the
correct server.
You should be able to install/uninstall software after this.
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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i can not use update manager or add or remove applications
https://bugs.launchpad.net/bugs/479801
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