If you run dpkg-reconfigure debconf -p low and select text mode and
priority low, followed by dpkg-reconfigure -ap low you will get
configuration questions of the type: use: 1. unix authentication 2.
consolekit 3. likewise 4. ... The choices should be seperated by a
space: 1 2 3 If you select everything and then change your /home folder:
sudo chmod -cR 777 /home* ; sudo -cR chown -cR 1000 /home/* you will get
faulty ~/.dmrc and ~/.dbus settings.

Many users will do that because they cannot remove installation files
from their home folder through nautilus gui (to save space for
instance). If you start: $ sudo nautilus you can change the permissions,
but only one by one. I suspect that is the problem. Since your different
authentication methods conflict, you experience a wide variety of
crashes. To get a backtrace you should start valgrind 'previously
crashed process' and then gdb 2>&1 | gdb-<previously_crashed_process>
and use gdb attach pid (check with pidof or ps -A).

The problem is that most crashes are fatal, requiring reboot and which
application will crash is unpredictable. I have not been able to
backtrace this properly, I am currently searching the proper debug
symbols: 'apt-cache search <packagename> | grep "dbg"'. Could you try
this out on VirtualBox or VMWare or a dedicated testing machine, or
better yet a server with many partitions? It could work, I promise.

-- 
Consolekit crashes due to /var/dbus/system_bus_socket 
https://bugs.launchpad.net/bugs/284653
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