Bug: unable to handle kernel NULL pointer dereference at

I have recently installed new system on my disc, Ubuntu 12.04. Installation proceeded without problems, I started installing additional software and put data from other discs. I had already two times bug report, it was quite long, and I have no idea how to acces to log file (which probably is somewhere saved) and since I had to switch off the computer using the button, anything else was possible, here is just a small part of it (what I've noted on paper)

could not write bytes: Broken pipe

speach dicpatcher disabled: edit etc/default/speach-dispatcher

saned disabled: edit ....

and than:

BUG: unable to handle kernel NULL pointer dereference at 0000009c

I've run Memory test in GRUB, everything is fine.

First time it occured when I was using rsync, second time when I was trying to install texlive.

Should I install whole system once again? Or can it be hardware problem? Or something else?

If there is any hardware details which may be relevant, please ask, since I have no idea what is happening, I don't know what kind of information could be useful.

Thanks

P.S.

dmesg output:

A NULL pointer deference error is from the kernel and it is highly likely to be a kernel bug, there is no need to re-install. It is hard to answer this question as there is not enough information. The kernel will emit a lot of debug information that helps kernel developers to determine what is causing this problem. This information appears on the console (you can switch to that using CtrlAltF1 and back again using CtrlAltF7, or the command:

dmesg

should show the full message.