did you manage to install amidiauto?
well i also had the error of not able to install amidiauto, then I tried the link
" Sorry I can’t really help you with that one, amidiauto is made by Blokas, maybe try to add their repository → BlokasLabs repository
and then install amidiauto again.".
you just click on that and paste everything except the 1st starting with # then enter. then update and install amidiauto.
that way works for me.