With the release of 20.04.3, that includes subiquity 21.08.2, this is now obsolete. (Even subiquity updated from 21.08.1 to a special build worked.) Hence I'm closing this ticket as Fix Released.
With the release of 20.04.3, that includes subiquity 21.08.2, this is now obsolete.
(Even subiquity updated from 21.08.1 to a special build worked.)
Hence I'm closing this ticket as Fix Released.