Comment 6 for bug 994064

I could fix this crash loally with "sudo chown -R lightdm.lightdm /var/lib/lightdm/" (on quantal).

The problem was:

 #0 g_logv (log_domain=0x0, log_level=G_LOG_LEVEL_ERROR, format=<optimized out>, args=args@entry=0x7fff6b957f48) at /build/buildd/glib2.0-2.34.0/./glib/gmessages.c:974
         domain = 0x0
         data = <optimized out>
         depth = <optimized out>
         log_func = 0x7f07b5e924c0 <g_log_default_handler>
         domain_fatal_mask = <optimized out>
         masquerade_fatal = <optimized out>
         test_level = <optimized out>
         was_fatal = <optimized out>
         was_recursion = <optimized out>
         msg = 0x13ee110 "Can not create directory '/var/lib/lightdm/.config/dconf': Permission denied"
         msg_alloc = 0x13ee110 "Can not create directory '/var/lib/lightdm/.config/dconf': Permission denied"
         i = 2

The owner and group of /var/lib/lightdm/.config were messed up.

Searching for "dconf-service crashed with signal 5 in __libc_start_main" on the net shows many bug reports, so maybe this symptom has multiple causes. To find out, install libglib2.0-0-dbg to get a meaningful stacktrace.