just to make some things clear:
- have you read this? http://tutorials.renoise.com/wiki/Linux_FAQ#Setting_up_third_parties_plugins
- are there no VSTs found or are they not loaded? check out the Renoise logfile to find out
- here’s the same kinda question (i think), does that help you at all? https://forum.renoise.com/t/linux-vst-path/31328
- and some more here: https://forum.renoise.com/t/linux-be-able-to-insert-the-vst-path-yourself/24567
if you’ve done all of this, i’m sorry. you did not mention trying any of that out, so that’s why i’m asking. hope your answer is somewhere in there.