ChromebookTips
Audacious won't start, doesn't recognize X display:
https://gist.github.com/bzub/65aabace4a60874c61ece4838b6219f3
If you can't get X11 or Wayland GUI Linux apps to start anymore on Chrome OS, try the following.
In the Terminal app, this will show the status of your systemd user services/units:
systemctl --user
If sommelier@0.service and sommelier-x@0.service show a failed status, the following worked for me:
sudo ln -s /opt/google/cros-containers/bin/sommelier.elf /usr/bin/
systemctl --user restart sommelier@0.service
systemctl --user restart sommelier-x@0.service
export DISPLAY=:0
Check again to see if those services are started now:
systemctl --user
Hopefully now X/Wayland apps work again.