Hi all.
I am trying to fix gnome sessions (gnome flashback) on Ubuntu 15.10+.

I started with fixing session name (flashback -> flashback-metacity) and disabling acceleration check (--disable-acceleration-check), but the sessions are still broken, they start as a black screen and crashes after few minutes.

Logs are inconclusive.
I guess services are failing to start and the problem is related to recent systemd-user-init and upstart mixture for sessions start-up.

Can anyone educate me how exactly the sessions are starting in recent releases and where the problem might be?

Thanks.