Beginning with Ubuntu 24.10, the Ubuntu on X.Org session support is now split off into its own separate package, aptly called “ubuntu-session-xsession”. This is similar to what has already been pursued by Debian and other Linux distributions for splitting up the X.Org session support into a separate build. This can be useful if wanting to remove X.Org dependencies from your system or otherwise just trying to maintain a modern Wayland-minded Linux desktop without any extra legacy support or cruft.
The ubuntu-session is set to recommend “ubuntu-session-xsession” and thus by default for now this Ubuntu X.Org session support will continue to be found out-of-the-box for those needing to fall-back to it on their systems or otherwise just preferring the X.Org session.
Glad this is an option. On my Fedora Silverblue system, I would always remove the Xorg session. Though I believe I was only removing the desktop file that GDM would read.
Seems like most Linux distributions are moving in this direction. Perhaps the year of the Wayland desktop is finally upon us :)