Pedro, thanks for your pointers. I'm a nubie but was able to figure out
that I needed to install nautilus-dbgsym to get a backtrace. If I run
"gdb nautilus" and set a breakpoint at main I can get a backtrace with
symbols, however if I unzip CoreDump.gz and run "gdb nautilus
~/Desktop/CoreDump" I get the following error: "Cannot access memory at
address 0xb7fac658". Backtrace produces a similar error:

#0  0xb75ee837 in ?? ()
Cannot access memory at address 0xbfdfbb64

Unfortunately when I installed nautilus-dbgsym I think it also upgraded
nautilus, so the symbols probably no longer match CoreDump at the time
of the crash, and I haven't seen this crash repeat. Are we SOL or is
there some way to recover a backtrace at this point? If you could give
me a pointer to forcing load of old symbols or some other technique I
will be happy to try again after work tomorrow (machine is at home).

-- 
nautilus crashed with SIGSEGV
https://bugs.launchpad.net/bugs/188537
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