afni.nimh.nih.gov

Howdy-

Yes, using WSL 1 is necessary for a Windows OS of that version number.

What is the output of the following if you copy+paste the following funny command into a WSL terminal:

grep -E 'DISPLAY|BRIDGE' ~/.*rc

(That is to check sure that step #4 here has been done:
[afni.nimh.nih.gov])

Secondly, have you installed the VcxSvr, as described in step #1 of the above link, and have you also started it running before opening your terminal?

--pt