Google meet(Gmeet) displays blank or black screen when sharing in the meet

This issue can be solved by following simple commands. All you need is editor and sudo permission(usually your same password as user).

Open the file /etc/gdm3/custom.conf is this does not exist in your machine open /etc/gdm3/daemon.conf.

Then uncomment the line WaylandEnable=false that is remove the # at the start of the line, save it and then do a reboot.

More information can be found from here and here.