Latest IncusOS (17 Nov I believe), only change wrt. default (to rule out a “machine not big enough“ reason):
config:
limits.cpu: '4'
limits.memory: 8GiB
devices:
vtpm:
type: tpm
Debian & Fedora VM work (cloud & basic flavours). Ubuntu 24.04 basic works.
Ubuntu 24.04/cloud and 25.04/cloud require Secureboot set to false and none of the standard config is being applied, so network is not being initialised, hostname is not being applied, etc.
Is that known or should I open an issue?