ow graphics mode should enable itself when it detects certain GL features are not available but there are times when you might want to force it on.  Here’s how you can force low graphics mode on 16.04 LTS (Xenial) :

   nano ~/.config/upstart/lowgfx.conf
   Paste this into it:

start on starting unity7
pre-start script
   initctl set-env -g UNITY_LOW_GFX_MODE=1
end script

   Log out and back in

If you want to stop using low graphics comment out the initctl line by placing a ‘#’ at the start of the line.

This won’t work in 16.10 Yakkety because we’re moving to systemd for the user session.  This will be fixed in due course.