Comment 23 for bug 1916469

Most Ubuntu users stick to the default session type which is now Wayland. And most Ubuntu users probably never open Thunderbird. So the subset of users affected by bug 1932328 is small compared to the overall set size (millions?). A fix is committed for bug 1932328 and coming in the next update.

We've been focussed on and discussing this issue for several years now, waiting for the right time to default to Wayland. We waited longer than other distros and made the switch in the April 2021 release. Asking to change it back for one Thunderbird bug makes no sense.

Aside from anything else, you can just choose Xorg on the login screen if you don't like the Wayland session. Change it once and your choice is remembered. You will never see Wayland again.