Hi, An update on this report, five years later. It describes two distinct problems, and they belong to two different components.
1. The session not closing when the shutdown is requested from inside the Cinnamon session. That part is a cinnamon-session bug, tracked in Debianas #987612: csm_manager_quit() calls logind PowerOff() but never quits the session, and cinnamon-session takes no delay inhibitor of its own, so with
a long delay inhibitor (unattended-upgrades with InstallOnShutdown and InhibitDelayMaxSec=1800) the session stays on screen past its RUNNING phase — hence the NotInRunning error you saw. It is reported upstream as https://github.com/linuxmint/cinnamon-session/issues/214, and a fix is proposed in https://github.com/linuxmint/cinnamon-session/pull/215 (still open): the session takes its own delay inhibitor before requestingPowerOff and quits when logind announces PrepareForShutdown. I tested that
patch in a VM: the session now disappears within a couple of seconds and the machine powers off when the remaining inhibitors allow it. 2. What you described from the greeter: LightDM does not stop, and it isstill possible to log in again while the shutdown is pending. That part is
this bug, and it is confirmed in the code: lightdm has no support for it at all. There is no reference to logind's PrepareForShutdown signal, and no inhibitor, anywhere in the tree — I checked lightdm 1.33.1, which is what unstable currently ships, and src/login1.c only subscribes to SeatNew/SeatRemoved and the CanGraphical/ActiveSession properties. So lightdm has no way to know a shutdown is in progress, and shows the greeter as usual. logind itself does not refuse the new login: I verified in a VM that the new session starts and works normally, and the machine then powers off under it when the delay expires. So this bug should stay open for the LightDM side only. It needs an upstream change; there is no issue or pull request about it on https://github.com/ubuntu/lightdm, so I've opened https://github.com/ubuntu/lightdm/issues/470
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