I installed ubuntu-frame on Ubuntu server, but when I tried to run a gtk GUI app (gnome-mastermind) then I got this error:
gtk cannot open display:
I followed these tutorials:
I was setting
WAYLAND_DISPLAY=wayland-0 but nothing helped.
Because the display was gray (ubuntu-frame default screen), I connected to it over ssh.
Why do I use Ubuntu server instead of Ubuntu core? Because I need to host my web app on apache but I need gui apps on the server.
And why not Ubuntu desktop? Because I want to save resources.