I have seen 2 discussions on this, one is on CentOS
which involves installing “xeyes”. However, this is not a valid package for debian-based systems and the author does not respond so I don’t know how to proceed.
Another discussion is by Jessie
she provides examples but does not explain exactly what is necessary to enable GUIs. No mention of ‘xeyes’ or an equivalent.
-e DISPLAY=unix$DISPLAY all that’s needed to get a GUI? If so, how do I specify when a GUI window appears? There are other apps in my container that do not require a GUI, what happens then?