well, mostly successful. emacs wont' start
@firstname.lastname@example.org for the record, some font library has been upgraded since 20.03 in such a way that apps built against 20.03 (including the Emacs in my profile) segfault when the /etc/fonts directory has been updated by the 20.09 font utils.
Don't ask for more detail, I don't have it. Cleaning up my profile fixed it.