Thanks for the additional information.
I close this bugreport now as it seems to be either a corrupted archive
or a corrupted disk.
Unfortunately I have no idea why your disk gets corruption, but I would
suggest running the memtester that is part of the ubuntu grub boot menu
to see if there is bad RAM in your computer.
** Changed in: update-manager (Ubuntu)
Status: Incomplete => Invalid
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Update Manager could not initialise package information
https://bugs.launchpad.net/bugs/239549
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