That is a bug seen in some cases with linux on very old LMMS releases(?)
What LMMS ver. have you installed?
See this:
MTTC 4: zasfx missing banks in 1 x
https://www.youtube.com/watch?v=foUqtb725JE
8 December 2014 at 13:36
That is a bug seen in some cases with linux on very old LMMS releases(?)