Since 17.10 I got familiar with Wayland and I really need the per-monitor-scaling!
How can I start a wayland session after dist-upgrade to Bionic? There is no option in GDM available out-of-the-box.
I do not see what is described as
The Wayland session will still be available, pre-installed
Best Answer
On the login screen, you should be able to select "Ubuntu on Wayland" by clicking on the settings icon, next to the login button.
If that option is not available under the cog icon on the password screen, make sure that
WaylandEnable=false
is commented out (or not present) in/etc/gdm3/custom.conf
Mine looks like this:
If you cannot log in to change this, start Ubuntu into recovery mode, go into root shell, and mount root partition as read/write: How do I boot into recovery mode?
From there edit the GDM config with
nano /etc/gdm3/custom.conf
and comment out the WaylandEnable line:#WaylandEnable=false