Sorry, I'm still a noob y many things. I've edited /etc/gdm3/custom.conf and I 
minded I was enabling wayland with this... 
I've disabled automatic login and rebooted, then make login by clicking on the 
gear to select wayland -before I tryed to make this by closing session, but 
then the gear didn't appeared, only the login button.
Then, when I run xrandr in terminal Igot this:
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 8192 x 8192
XWAYLAND0 connected 1280x800+0+0 (normal left inverted right x axis y axis) 
330mm x 210mm
   1280x800      59.81*+

And then I tryed to connect the external monitor and now it works! Then 
obviously the problem is xorg.
Now the question is... how can I set wayland to be used as default instead of 
xorg for using wayland at autologin? Thanks! Your questions and procedures 
guided me to find the problem. "Give a fish to a man and he will eat for a day, 
teach him to be a fisherman and then he will eat everyday"

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1796528

Title:
  Problem with dual monitors

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1796528/+subscriptions

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