Comment 86 for bug 1251281

On Thu, Apr 23, 2015 at 09:02:19AM -0000, martin lantz wrote:
>I logged into NX using gnome-terminal. From there I run:
>/usr/bin/gnome-session --session=gnome-flashback --disable-acceleration-check &> gnome-session.log.0
>
>The desktop background image appears, but nothing else seems to work.
>
>I uploaded gnome-session.log.0 here:
>http://pastebin.com/tvVU2fMa

Looks like the /etc/X11/Xsession wrapper is being used; it's trying to
launch an Upstart session. In this case you need to export:

DESKTOP_SESSION="gnome-fallback"
XDG_CURRENT_DESKTOP="Unity"

in order for the upstart Xsession.d scripts to work properly.