You don't need to worry about anything in between. The 'Untrap Signals'
bit disables Xorgs own signal handler, and then the 'Post-mortem
backtrace' section tells you how to get Xorg to do a core dump when it
crashes, which you run gdb on afterwards.

I forgot to mention, you will need to install libgl1-mesa-dri-dbg,
xserver-xorg-core-dbg, xserver-xorg-dbgsym and libc6-dbg. To get all of
these, you should add the following line to your /etc/apt/sources.list:

deb http://ddebs.ubuntu.com hardy main universe

Then run:

sudo apt-get update
sudo apt-get install libgl1-mesa-dri-dbg xserver-xorg-core-dbg 
xserver-xorg-dbgsym libc6-dbg

-- 
[Intrepid] Intel graphics card only runs with NoDRI option
https://bugs.launchpad.net/bugs/277709
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