From CCP4BB
Thanks to everyone who gave helpful suggestions; I now have stereo working on Ubuntu 18.04.
To help anyone who comes across this in the CCP4 archives in the future, it was necessary to:
1) Install lightdm and set it as the default display manager. Other display managers that don't do compositing may also work.
2) Install a suitable desktop environment (I used gnome flashback metacity in the end, but XFCE also works).
3) Edit the Xorg configuration (which is now a series of files in /usr/share/X11/xorg.conf.d) to include “Stereo” “10”, and “Composite” “Disable”.
The step I was missing was the first one. In Ubuntu 16.04, stereo worked without having to do this.
Thanks again,
Chris – Dr Chris Richardson :: Sysadmin, structural biology, icr.ac.uk