Roderick Johnstone wrote:
On the other hand, if I select reboot from the Application Launcher
Leave menu, it just reboots straight away.
Maybe the Leave menu items are using a different polkit action or
somehow bypassing polkit?
What display manager are you using? If you're still using KDM (which is from
Plasma 4, it was NOT ported to the Qt 5 and KDE Frameworks 5 libraries used
by Plasma 5), then KDM's own settings apply. (KDM runs as root and has its
own idea of what users to allow rebooting.)
Kevin Kofler