I have no Wayland login option in GDM (GNOME). I found out that the folder .X11-unix is owned by gdm.
If I set root as owner of the .X11-unix ( thx @ringo ), I get back the Wayland login option and it seems that the login then works. But after a reboot the folder .X11-unix is again owned by gdm.
Can someone point me to solution for this problem?
# GDM configuration storage
[daemon]
AutomaticLoginEnable=False
# Uncomment the line below to force the login screen to use Xorg
#WaylandEnable=false
[security]
[xdmcp]
[chooser]
[debug]
# Uncomment the line below to turn on debugging
#Enable=true