please verify that it's actually installed: dpkg -l "fluidsynth*"
does fluidsynth-dssi appear on the output?
ps. if it's actually installed, ie. has the ii prefix above then I suspect it's packaged on non-standard DSSI plugin system paths; it should be under /usr/lib/dssi/ or /usr/local/lib/dssi; check with dpkg -S fluidsynth-dssi the whereabouts of fluidsynth-dssi.so and add it to DSSI plugin search paths in qtractor > View > Options.... > Plugins > Paths); don't blame me nor qtractor: that's one original canonical/debian blunder :)
please verify that it's actually installed:
dpkg -l "fluidsynth*"
does
fluidsynth-dssiappear on the output?ps. if it's actually installed, ie. has the
iiprefix above then I suspect it's packaged on non-standard DSSI plugin system paths; it should be under/usr/lib/dssi/or/usr/local/lib/dssi; check withdpkg -S fluidsynth-dssithe whereabouts offluidsynth-dssi.soand add it to DSSI plugin search paths in qtractor > View > Options.... > Plugins > Paths); don't blame me nor qtractor: that's one original canonical/debian blunder :)