Cannot share screen on Zoom in Ubuntu 17.10

For me this worked well:

step 1: sudo chmod 777 /etc/gdm3/custom.conf
step 2: gedit /etc/gdm3/custom.conf
step 3: uncommented WaylandEnable=false
step 4: save file and close
step 5: restart computer
setp 6: now, can share screen on skype, hangouts and zoom

My SO is ubuntu 17.10

I used this command and it worked fine for me but I think the lightdm won't be used anymore but this can probably help someone:

sudo dpkg-reconfigure lightdm

If lightdm is not installed just run the sudo apt-get install lightdm and a screen with 2 options will popup pick lightdm and restart.

And btw this should also work:

sudo vi /etc/gdm3/custom.conf
uncomment #WaylandEnable=false
restart

I was also faced this issue. After do the following changes and restart, helped me to fix this issue.

Please check https://unix.stackexchange.com/a/336227/260822

Hope It will be helpful for you as well.

I was having the same problem with Fedora 26. Looks like wayland is a window manager that some distros are using in lieu of X11 (Xorg). To see what window manager you're using you can use the following:

echo $XDG_SESSION_TYPE

In Fedora, I can select the desktop environment (gnome with Xorg) at the login screen which will enable X11 instead of Wayland - looks like you can do the same with Ubuntu.

This ticket has more information if you're interested: https://unix.stackexchange.com/questions/336219/gnome-defaults-to-wayland-how-can-i-go-to-back-to-x11