bad Utopic update?

[Adam Dingle]

I normally run Ubuntu 14.10 (Utopic) - it has been quite stable for months
now.  This morning I applied software updates as usual, attempted to reboot
and saw a blank black screen with a mouse cursor and nothing more.  I used
Ctrl+Alt+F1 to switch to a console and logged in.  As I did so, I saw these
messages:

[544.201533] system-logind[925]: Failed to start unit user at 1000.service:
Unknown unit: user at 1000.service
[544.201586] system-logind[925]: Failed to start user service: Unknown
unit: user at 1000.service

'ps -ef' showed that the X server was running.  I didn't attempt to debug
much further - I needed a working machine, so I made a fresh overinstall
from a daily ISO of 14.10.  That worked for a few hours, but then after
another reboot I was stuck at a blank screen again.

Has anyone else seen this?  I think I'll have to drop back to Trusty until
this can be fixed.  Thanks -

adam
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