hm is there something wrong?
root@zynthian:~# dpkg -l|grep -i vitalium
ii vitalium-lv2 5:20210302.2 armhf Spectral warping wavetable synth (LV2)
root@zynthian:~# apt search vitalium
Sorting... Done
Full Text Search... Done
vitalium/bionic 5:20210306 all
Spectral warping wavetable synth
vitalium-lv2/bionic 5:20210306 armhf [upgradable from: 5:20210302.2]
Spectral warping wavetable synth (LV2)
vitalium-vst/bionic 5:20210306 armhf
Spectral warping wavetable synth (VST2 and VST3)