It looks like the bug is actually in unity8-desktop-session. It installs
/usr/share/lightdm/lightdm.conf.d/45-unity8.conf, which sets session-
wrapper=lightdm-unity8-session, which means lightdm-unity8-session is
run in order to start *any* session. lightdm-unity8-session is a shell
script that's also part of unity8-desktop-session, and looking at its
contents, it appears to be buggy because it assumes that any session
that doesn't use X (such as Wayland) is Unity 8 and should run upstart
instead of lightdm-session.
I was able to work around this by creating a file
/etc/lightdm/lightdm.conf.d/00-willmo.conf with contents
[Seat:*]
session-wrapper=lightdm-session
This overrides the offending setting in 45-unity8.conf and sets session-
wrapper back to the default, avoiding the Unity 8 assumptions in
lightdm-unity8-session. After rebooting, Wayland sessions now work for
me.
** Also affects: unity8-desktop-session
Importance: Undecided
Status: New
** Also affects: unity8-desktop-session (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1632772
Title:
GNOME on Wayland does not start from LightDM
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