Thanks for your bugreport.
This sounds like the lists file is/was corrupted at some point. Could you
please open a terminal and run:
$ sudo rm /var/lib/apt/lists/us*
$ sudo apt-get update
and see if that fixes the problem?
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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Could not initialize the package information
https://bugs.launchpad.net/bugs/225830
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