Thanks for your report.
You can solve this by running the following command:
sudo apt-get install --reinstall apparmor
Let us known if this fixes your problem.
** Changed in: apparmor (Ubuntu)
Status: New => Incomplete
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package apparmor 2.3+1289-0ubuntu4.1 failed to install/upgrade: package
apparmor is already installed and configured
https://bugs.launchpad.net/bugs/298223
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