The gnome-settings-daemon updates plugin is gone and update downloading
is handled by gnome-software instead. Adapt the live image schema
overrides for the changes.
Using >> means we have a custom.conf file that looks like this:
[daemon]
...
[daemon]
AutomaticLoginEnable=True
AutomaticLogin=liveuser
Which is the first reason why it's failing. Change the cat append to replace as
the other sections are optional.
Additionally, the livesys legacy service is not completing before gdm is being
started, which means the config file is being read before it has been altered.
This can be fixed by adding a LSB-style "X-Start-Before: display-manager" in the
header of livesys.
