It seems like Ubuntu 20.04's server images only support Ubuntu's 'subiquity server installer', and drops the debian-installer ('d-i') option. See related docume

It seems like Ubuntu 20.04's server images only support Ubuntu's 'subiquity server installer', and drops the debian-installer ('d-i') option. See related documentation (though it is still not marked as stable): https://wiki.ubuntu.com/FoundationsTeam/AutomatedServerInstalls https://wiki.ubuntu.com/FoundationsTeam/AutomatedServerInsta... Posting this here for awareness for those who, like me, may be wanting to update Packer build configs for 20.04 and are finding it a completely different experience from 12/14/16/18.04 LTS releases...