Ubuntu 16.10 Doesn't Reboot

[Stephen Morris]

Hi,

     I have an issue with Ubuntu 16.10 when I select reboot from the KDE 
launcher or from the Gnome title bar, in that the Ubuntu boot graphic 
flashes on the screen briefly and switches my monitor into power saving 
mode but never reboots, I have to press the reset button on my desktop 
pc to do the reboot. Has anybody seen this behaviour before and have an 
idea what is required to rectify this?


regards,

Steve