[LightDM] Setting default X session

[Сергей]

Hello everybody,

I'm trying to change the default X session in an Ubuntu derivative, and I
can't figure out how to do that.

I'm aware of the default-xsession and default-user-session settings in
lightdm.conf, but Ubuntu has them commented out. The session wrapper seems
to receive the session as an argument, but I can't find what launches the
wrapper script.

Also, when there's only one xsession available, I get a black screen instead
of getting the only available session loaded (with auto-login enabled),
which is probably a bug. The same session works fine if I disable
auto-login, get to the greeter and choose the session there.

So, my question is, what exactly manages default sessions, and how do I
change the default session for auto-login?

Cheers
--
Sergey "Shnatsel" Davidoff
elementary OS integrator
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