You might want to take a look at the following:
https://answers.launchpad.net/ubuntu/+question/145648
https://answers.launchpad.net/ubuntu/+source/apt/+question/131789
Unfortunately, both of them point to a corrupted disk ...
If it happens to result in of them, I'll mark this bugs as invalid, have a nice
day
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https://bugs.launchpad.net/bugs/1068421
Title:
System can not install updates or new software from the software
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