So from testing the 2009-07-24 image, it's undefined which session gets
booted into. I've sometimes gotten mythbuntu.desktop picked, other
times xterm.desktop and other times xfce.desktop.
So the only workaround that I can see with the current package is to
ship gnome.desktop in mythbuntu-default
Upstream said that they ship the gnome.desktop file in its own binary so
xfce for example would just not install this one
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9.10 A3 candidate ISO, default session is not mythbuntu
https://bugs.launchpad.net/bugs/403291
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Desktop
** Changed in: gdm (Ubuntu)
Importance: Undecided => Low
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9.10 A3 candidate ISO, default session is not mythbuntu
https://bugs.launchpad.net/bugs/403291
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gdm in ubuntu.
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desktop-bugs
I checked gdm's session behaviour. If the user does not have a ~/.dmrc,
the default is determined by ./daemon/gdm-session-direct.c,
get_fallback_session_name().
This checks if a "gnome" session is available, and uses it if so. If
not, it takes the first available session in /usr/share/xsessions/.