I was on the meta package non-qubes-whonix-workstation-cli
the release-upgrade script got an error that the meta package it wanted wasn’t found, I replaced it with whonix-workstation-nonqubes-cliwhich seemed like the most similar meta package that existed in 18. then after upgrading I got some errors from whonix-check, and installed whonix-workstation-vm-serverand then everything seems to be good.