With libglib2.0-0-dbg installed, I attempted to retrace with "sudo
apport-retrace -g" followed by the .crash file. This is all I got for
the trace:

Program terminated with signal 5, Trace/breakpoint trap.
#0  0x004d03f9 in g_return_if_fail_warning (
    log_domain=0x83de401 "\344=\b\360\263v\a schema 
'org.gnome.settings-daemon.plugins.power' is not installP", 
pretty_function=0x0, expression=0x0)
    at /build/buildd/glib2.0-2.29.8/./glib/gmessages.c:582
582     /build/buildd/glib2.0-2.29.8/./glib/gmessages.c: No such file or 
directory.
        in /build/buildd/glib2.0-2.29.8/./glib/gmessages.c
(gdb) bt
#0  0x004d03f9 in g_return_if_fail_warning (
    log_domain=0x83de401 "\344=\b\360\263v\a schema 
'org.gnome.settings-daemon.plugins.power' is not installP", 
pretty_function=0x0, expression=0x0)
    at /build/buildd/glib2.0-2.29.8/./glib/gmessages.c:582
#1  0x00000005 in ?? ()
#2  0x083de401 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) 

I invoked ubuntu-bug with the .crash file and examined the stack trace
to make sure I wasn't making a mistake, and confirmed that this is the
crash file from this bug, even though the not very successful retrace
looks quite different. (I did not resubmit the report.) A full session
transcript (with a few control characters from interactive prompts
removed for easy reading) is attached.

Do you have any recommendations for another way to get a good trace?
(The crash has not recurred yet. Or, if it has, Apport has not been
triggered, perhaps because of the constant crashing of nm-applet every
second or so on the same machine, due to bug 797498. I'll update shortly
to get the fix for that.)

** Attachment added: "retrace-attempt-session-log.txt"
   
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/797486/+attachment/2169676/+files/retrace-attempt-session-log.txt

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https://bugs.launchpad.net/bugs/797486

Title:
  gnome-power-manager crashed with signal 5 in g_object_newv()

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