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.
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https://bugs.launchpad.net/bugs/994064
Title:
dconf-service crashed with signal 5 in __libc_start_main()
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