This is the error message I get when trying to logout or shutdown from the menu in Xubuntu 16.04 on my Dell laptop.
Interestingly when I choose "Log Out..." from the actions menu the first time nothing happens, but if I try it again then do I get the Session manager must be in idle state when requesting a shutdown
error dialog.
I have tried the answers here and here and some others from google to no avail.
I am able to shutdown by running sudo shutdown now
from the terminal.
Not sure how to proceed.
sudo aptitude purge ~o
). Reinstalling nvidia driver in "Additional Drivers" tab in "Software & Updates" dialog fixed it. – jarno Apr 19 '19 at 08:03