I got warning messages related to a ubuntu advantage package, and it seems related to Ubuntu Pro that I didn't sign-up for.
Ubuntu Advantage (Pro) warning messages
dpkg: warning: unable to delete old directory '/var/lib/ubuntu-advantage': Directory not empty
dpkg: warning: unable to delete old directory '/etc/ubuntu-advantage': Directory not empty
In order to remove this package just runs.
sudo apt-get purge --autoremove ubuntu-advantage-tools