I have the same problem described. In my case, none of the display managers 
will load because all of them fail with a segfault in libgio-2.0.so.0.3000.0. I 
have tried purging
all of the dm's and starting anew as well as changing lightdm config, but I 
still can't use a graphical display because of that one file that causes a 
problem in every
login program I use. I have also tried reinstalling the package that contains 
the .so file that is segfaulting (libglib2.0-0), but the file does not change 
at all. 
I have the packages you describe installed. I am not sure how I can get my 
computer to function correctly.

However, something interesting is happening in my logs that I think may be 
related to this failure, or perhaps even the cause of the segfault. My 
~/.xsession-errors log
file gives, in about 100 very specific lines detailing what exactly it can't 
load, the general impression that it can't connect to DBus. I am not sure if 
this is a common 
error that happens when there is an X problem, or one that is a symptom of a 
more specific problem. I will upload my log files, see if you can take a look, 
and maybe tell
me how to temporarily at least how to get a working graphical environment.

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https://bugs.launchpad.net/bugs/921995

Title:
  lightdm doesn't start: Maximum number of clients reached

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