Comment 4 for bug 1878324

Suspicious message
invoke-rc.d: could not determine current runlevel
invoke-rc.d: unknown initscript, /etc/init.d/docker not found.

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Setting up cgroupfs-mount (1.4) ...
invoke-rc.d: could not determine current runlevel
Setting up containerd (1.3.3-0ubuntu2) ...
Setting up docker.io (19.03.8-0ubuntu1) ...
invoke-rc.d: unknown initscript, /etc/init.d/docker not found.
invoke-rc.d: could not determine current runlevel
Setting up dnsmasq-base (2.80-1.1ubuntu1) ...
Setting up ubuntu-fan (0.12.13) ...
invoke-rc.d: could not determine current runlevel
Processing triggers for systemd (245.4-4ubuntu3) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for dbus (1.12.16-2ubuntu2) ...
Processing triggers for libc-bin (2.31-0ubuntu9) ...