Thanks for your report.
This is due to the failure of the previous upgrade session that failed because
of a locked debconf database.
you can try to recover with the following command:
sudo dpkg --configure -a
or
sudo dpkg-reconfigure apparmor libapparmor1
** Changed in: apparmor (Ubuntu)
Status: New => Incomplete
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package libapparmor1 2.3+1289-0ubuntu4.1 failed to install/upgrade: package
libapparmor1 is already installed and configured
https://bugs.launchpad.net/bugs/299908
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