So it seems that cabal is globally broken on 18.04 and derivatives.
Wonder if stack would work ok.
About to test some lightweight non-systemd debian derivatives (Devuan chimaera and GNUinos) but there's no reason it shouldnt work.
I casually got warnings on superfm memory access on SC startup, maybe one with only 2-op crossmod should be enough, like half of an YS200 rather than a DX7 !