Same problem for me (Xubuntu 20.04) and NOT a guest session. Two regular users here and this has happened to both.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1855350 Title: Will not logout or shutdown from guest-session Status in lightdm package in Ubuntu: Confirmed Status in xfce4-session package in Ubuntu: Confirmed Bug description: This is in Xubuntu 19.10, a regression from 18.04. xfce4-session 4.14.0-0ubuntu1. I enabled guest-session and logged in that. But there I can not log out or even shut down using the graphical way at least unless put Action Buttons on the panel and choose Switch User. If I run "xfce4-session-logout -l" I get error dialog saying: Received error while trying to log out GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs:Type of message, "(yb)", does not match expected type"(b)" And in standard output there is: "Received error while trying to log out, error was GDBus.Error:org.xfce.SessionManager.Error.Failed: Session manager must be in idle state when requesting a shutdown" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1855350/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
