package:libreoffice-common:1:6.0.7-0ubuntu0.18.04.13
Unpacking libreoffice-core (1:6.4.7-0ubuntu0.20.04.8) over (1:6.0.7-0ubuntu0.18.04.13) ...
dpkg: regarding .../23-libreoffice-common_1%3a6.4.7-0ubuntu0.20.04.8_all.deb containing libreoffice-common:
 libreoffice-common conflicts with apparmor (<< 2.13.1~)
  apparmor (version 2.12-4ubuntu5.3) is present and installed.

dpkg: error processing archive /tmp/apt-dpkg-install-MeWbSv/23-libreoffice-common_1%3a6.4.7-0ubuntu0.20.04.8_all.deb (--unpack):
 conflicting packages - not installing libreoffice-common