Probably you added some malformed line into the file
/etc/apt/sources.list, did you check if there is an error on line 55?
** Changed in: ubuntu
Assignee: (unassigned) => Pascal De Vuyst (pascal-devuyst)
Status: New => Incomplete
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[Hardy] Package manager can no longer be reached
https://bugs.launchpad.net/bugs/207366
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