Bug#958025: gnome-shell: Wayland session never starts

[Simon McVittie]

On Fri, 17 Apr 2020 at 15:48:51 +0100, Sam Morris wrote:
>     Apr 17 15:16:09 gnome-session-binary[26371]: WARNING: Error creating FIFO: File exists

>From the gnome-session source code, this is something to do with
gnome-session running sessions as systemd user services, which is new in
GNOME 3.36. It wouldn't surprise me if this relies on relatively recent
features or fixes in systemd or a related component.

> ... it seems suspicious that trying to connect to (presumably) Xwayland
> on the login screen

AT-SPI :'-(

The GNOME developers have been trying to disentangle gnome-session,
gnome-settings-daemon etc. from X11, so that Xwayland is only started
when you need it - but it wouldn't surprise me if that needs fixes in
many components, which you probably don't have in a partial upgrade.

On which subject...

> ii  libatk-bridge2.0-0                           2.30.0-5
> ii  libatk1.0-0                                  2.36.0-2

One of these relatively-closely-related libraries is 18 months older than
the other. Perhaps the missing versioned dependency involves ATK/AT-SPI?

> ii  libegl-mesa0 [libegl-vendor]  18.3.6-2+deb10u1
> ii  libgl1-mesa-dri               18.3.6-2+deb10u1
> ii  libglx-mesa0 [libglx-vendor]  20.0.4-2

This also looks suspicious to me: you're mixing up modules from versions
of Mesa released 2 years apart.

    smcv