@dbungert, desktop also wants dualboot options, but the Ubuntu 23.04 installer does not list existing LUKS1 or LUKS2 partitions mapped to /dev/mapper/ using cryptsetup open. That was reported as https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/1750645 back in Ubuntu 18.04 and is still unresolved.
@dbungert, desktop also wants dualboot options, but the Ubuntu 23.04 installer does not list existing LUKS1 or LUKS2 partitions mapped to /dev/mapper/ using cryptsetup open. That was reported as https:/ /bugs.launchpad .net/ubuntu/ +source/ subiquity/ +bug/1750645 back in Ubuntu 18.04 and is still unresolved.