OK - I just ran 'sudo restart lightdm' and the login screen appeared and I
was able to log in!  Yes, magic.  Thanks for the suggestion!

adam


On Fri, Aug 29, 2014 at 2:16 PM, Kai Mast <[email protected]> wrote:

> Just an idea: Sometimes "sudo restart lightdm" magically fixes such
> problems.
>
> Kai
>
>
> On Fri, Aug 29, 2014 at 2:13 PM, Adam Dingle <[email protected]> wrote:
>
> 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 [email protected]:
> Unknown unit: [email protected]
> [544.201586] system-logind[925]: Failed to start user service: Unknown
> unit: [email protected]
>
> '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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>
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