Hi and thanks for your report, this does not have the complete logs, so I might struggle to see the root cause, lets try.
The interesting lines I see int he bug are: E: Command line option --mode is not understood in combination with the other options dpkg: error processing package libvirt-daemon-system (--configure): installed libvirt-daemon-system package post-installation script subprocess returned error exit status 100 That is not an error I have seen before. The failing script is /var/lib/dpkg/info/libvirt-daemon-system.postinst The only "--mode" I see in there is on: install --mode 644 /dev/null "$LOCAL_APP_PROFILE" Which is added by dh_apparmor (adding apparmor bug task for that). One such section looks like: 304 LOCAL_APP_PROFILE="/etc/apparmor.d/local/usr.lib.libvirt.virt-aa-helper" 305 306 test -e "$LOCAL_APP_PROFILE" || { 307 mkdir -p `dirname "$LOCAL_APP_PROFILE"` 308 install --mode 644 /dev/null "$LOCAL_APP_PROFILE" 309 } There is no conditional in between, so this will always be: $ install --mode 644 /dev/null "/etc/apparmor.d/local/usr.lib.libvirt.virt-aa-helper" I don't see where that would fail. Maybe the apparmor developers know a bit more about this, for libvirt I'd not know where to continue on this. ** Also affects: apparmor (Ubuntu) Importance: Undecided Status: New ** Changed in: libvirt (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1808044 Title: package libvirt-daemon-system 4.0.0-1ubuntu8.5 failed to install/upgrade: installed libvirt-daemon-system package post- installation script subprocess returned error exit status 100 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/1808044/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs