can't open vs code in image built on `ubuntu-vnc-xfce-g3`

at least as of https://github.com/capsulecorplab/ltc-workspace-image/commit/2c8e0d2876444631ad8cdcc89825a1f37c0e4729 ![Screenshot from 2022-12-07 08-02-25](https://user-images.githubusercontent.com/14095576/206246360-11c0dd5c-e5eb-4776-9087-8de18655da8f.png)
