I followed the test case in a virtual machine, sys_vendor of QEMU, and was able to upgrade with the dist-upgrader tarball from hirsute- proposed.
bdmurray@clean-groovy-amd64:/tmp/dist-upgrade$ cat DistUpgradeVersion.py VERSION = '21.04.12' bdmurray@clean-groovy-amd64:/tmp/dist-upgrade$ cat /sys/class/dmi/id/sys_vendor QEMU -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1929449 Title: do not allow upgrades to hirsute for Apple hardware To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1929449/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
