I naively attempted to use the new Deb822 format in the apt
sources.list but it doesn't appear to be supported there. Reading the
manual page makes me think it isn't supported there because the file
ends in .list. It would be nice if the main sources.list could either
be Deb822 format or if /etc/apt/sources were introduced for that.

E: Type 'Types:' is not known on line 1 in source list /etc/apt/sources.list
E: The list of sources could not be read.