What version of ubuntu do you use? What happens if you run:
$ sudo dpkg --configure -a
$ sudo apt-get install -f
$ sudo apt-get install --reinstall update-manager-core
?
Thanks,
MIchael
** Changed in: update-manager-core (Ubuntu)
Status: New => Incomplete
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update-manager-core requires 0.81 but it is not installed
https://bugs.launchpad.net/bugs/185906
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