Maybe this is only a virtualbox problem, but starting mga6, login in console & enter "halt" hangs in the last step "reboot: System halted", but the window is still open & on close Virtualbox asks how to shutdown. Reboot works correct. Maybe this can also leed to problems in shutdown on real hardware?
You must use "poweroff" instead of "halt" if you. This is the systemd behavior for a couple years now... See systemctl man page for details. Basically, halt == "systemctl halt" => the system is halted but not powered off poweroff == "systemctl poweroff" => the system is halted AND powered off
Status: NEW => RESOLVEDCC: (none) => thierry.vignaudResolution: (none) => INVALID