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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 :)