Man pages matching name setvtrgb in section 8:

setvtrgb.8.en	debian 10 / kbd
setvtrgb.8.en	debian 11 / kbd
setvtrgb.8.de	debian 11 / manpages-de
setvtrgb.8.en	debian 12 / kbd
setvtrgb.8.de	debian 12 / manpages-de