Hi-
We haven't checked this on a 18.04 Ubuntu machine internally, but this thread describes a dependency installation for that system that seemed to resolve the issue:
[
afni.nimh.nih.gov]
Also, can I ask why are you using a virtual box? I would imagine that performance would not be as great as with a straightup AFNI installation, which is possible on either Mac, Windows or various flavors as described here:
[
afni.nimh.nih.gov]
--pt