A very pleasant surprise with GhostBSD MATE 10.3 ALPHA1 last night !
I was able to install it (no freeze).
Of course, not everything is perfect but it works.
There are still some small details to work : MATE to be translated into French, no user folders (even after downloading xdg-user-dirs), US keyboard at login instead of the French one, no sound ...
But all that seems on track.
Now I look forward the Xfce version...
Great to see things are improving!
The XFCE versione will come, I'm using it.
about GDM locale, you could temporarily apply a workaround manually:
edit /usr/local/etc/gdm/locale.conf and change the followings: