sddm not starting after upgrade

[Jonathan Riddell]

Today's update has a nice daily image working well with ubiquity-dm but
seems to fall for a mysterious bug on some upgrades where login manager
sddm does not run if you reboot

https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1431332

you can start it manually by logging in at the linux console and running
systemctl start sddm

and a reinstall of the live cd fixes it

but as yet I've no idea what makes it not start sddm.  Any suggestions
welcome.

Jonathan
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