User can't shutdown?

[Richard Hector]

Hi all,

On a couple of machines I set up for someone else, the ordinary user can 
no long shut down or reboot the machine - eg from the xfce4 Action Buttons.

These are running (and were installed with) Debian 12 bookworm. I'm sure 
shutting them down used to be possible, so I assume some package upgrade 
has changed this?

Any hints?

Thanks,
Richard