Public bug reported:
In order to respect the local initscript policy layer that may be
present in /usr/sbin/policy-rc.d, the postinst script of the udev
package should use "invoke-rc.d stop" instead of "systemctl stop".
This direct systemctl call can be found in the handle_service_rename()
function :
handle_service_rename() {
if dpkg --compare-versions "$2" lt "204-1"; then
if [ -d /run/systemd/system ]; then
systemctl stop udev.service udev-control.socket udev-kernel.socket
>/dev/null 2>&1 || true
fi
fi
}
Using "systemctl stop" during unattended-upgrades in shutdown mode hangs
and leaves the dpkg database in a broken state after reboot. Using a
local initscript policy layer that prevents start/stop/restart actions
on this case is a way to prevent those hangs but maintainer scripts have
to use invoke-rc.d instead of direct systemctl calls.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1803530
Title:
[Xenial][udev] postinst script should use "invoke-rc.d stop" instead
of "systemctl stop"
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