I have searched Google and this one came at the top, but this seems old, because a lot of those things do not match with the latest “Cassini” installation.
It is a desktop with an RTX card. I installed Endeavour, and chose Gnome, and kept most default installation packages except that I unchecked AMD/Intel GPU things. I chose the default “System-boot”. I (think) installed the proprietary Nvidia driver with nvidia-inst (series 525 or something).
However, in the login screen, the gear icon that lets users choose Wayland/X11 is not there. nvidia-drm.modeset=1 seemed to be there by default. The /usr/lib/udev/rules.d/61-gdm.rules file was complex, but reading the comment, it seemed that for Ndivida driver 5XX, it did not seem to disable Wayland, so I did not modify that file. I ran gsettings set org.gnome.mutter experimental-features '["kms-modifiers"]'. I set WaylandEnable=true in /etc/gdm/custom.conf. Wayland, egl-wayland something all seemed to have been installed.
What do I need to do more?