Comment 3 for bug 1872183

Hello Mark,

Debian chrony maintainer here.

So, this error occurs when attempting to rehabilitate systemd-timesyncd when
uninstalling/purging chrony (see restore_timesyncd() in d/postrm). This used
to be possible when systemd-timesyncd and chrony were co-installable but since
systemd 245.4-2{,ubuntu1}, this is no longer the case because systemd-timesyncd
is now a standalone package conflicting with chrony, hence the exit status 1.

To fix this, the restore_timesyncd() function found in the chrony
3.2-4ubuntu4.2 postrm script should be updated as follows:

restore_timesyncd() {
    # on next reboot it would start, but that would leave time
    # unsynchronized until then. So as the Conflicts in the service file
    # kill systemd-timesyncd re-establish it if it is enabled
    if [ -d /run/systemd/system ]; then
        deb-systemd-invoke start systemd-timesyncd || true
    fi

From what I can see, the chrony version found in Disco Dingo is also be affected by this issue.

Cheers,
Vincent