If I leave the computed idle for a long amount of time when I try to shutdown using the options from the top bar nothing happens. As a work-around, I can log out first and then use the shutdown in the greeter top right-hand corner. Otherwise, shutdown from the terminal also works. Grub options are as follows: GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi=force reboot=acpi" In /var/log/syslog I see this error: wingpanel[4143]: EndSessionDialog.vala:112: Unable to reboot: GDBus.Errorrg.freedesktop.DBus.Error.InteractiveAuthorizationRequired: Interactive authentication required.