>> In addition to the stack traces, please collect the following
>> information (before logging in via unity-greeter, so use Ctrl-Alt-F1
>> to log in via a VT or ssh into the machine)
>
> Attached zip with files
Nothing looks strange there.
>> Please get a stack trace, either by looking at the core file or by
>> attaching a debugger before it crashes.
>
> I don't know how to do it. There is no lightdm-dbg or unity-greeter-dbg packages.
>> In addition to the stack traces, please collect the following
>> information (before logging in via unity-greeter, so use Ctrl-Alt-F1
>> to log in via a VT or ssh into the machine)
>
> Attached zip with files
Nothing looks strange there.
>> Please get a stack trace, either by looking at the core file or by
>> attaching a debugger before it crashes.
>
> I don't know how to do it. There is no lightdm-dbg or unity-greeter-dbg packages.
I'll upload debug packages later.