Comment 5 for bug 2045668

The usrmerge transition was completed already in Ubuntu several cycles ago. We should not promote usr-is-merged to main, we should drop the dependencies on it instead.

usrmerge can also be dropped from main now. It is only in main because it is seeded with the rationale:

 * (usrmerge) # xnox Default since Disco. Will be mandatory in 22.10. Only recommend, such that it is installed on upgrades, can be removed afterwards.

The comment is misleading, the commit talking about "mandatory in 22.10" was made in November 2020. We've had a full LTS cycle since then where users, whether on new installs or upgrades, have been in a usrmerge configuration and there is no support for non-usrmerged filesystems in Ubuntu 21.04 or later.

So we should drop this recommends, drop usrmerge source from main, and drop dbus's dependency on usr-is-merged.