There is evidence that with the combination of determined harwdware Ubuntu 8.04 (and also other distros) are causing the linux box freezes.
Some blame the new kernel (experimental version 2.6.24-19-generic) and anotthers to video drivers and the list goes on. I am convinced that is the kernel because there was no prior drawbacks.
What to do? Well, we know that ubuntu is unstable, at least more unstable than debian stable, so that nothing of serving complaints, better fill a bug report and rely on the willingness of the developers. It is always better to rely on closed source solutions, of course:)
So if you do not want to go through these issues simply taken because you'll be happy and (though perhaps outdated). For those of us who love the thrill and the risk will still shocks, as when everything grows.
But do not despair the solution is quite simple. Here the steps to follow.
Open a terminal window.
sudo gedit /boot/grub/menu.lst
Find the line boot of the image that these running, we could well see
kernel /vmlinuz-2.6.24-19-generic root=/dev/md2 ro quiet splash
kernel /vmlinuz-2.6.24-19-generic root=/dev/md2 ro quiet splash locksource=acpi_pm nolapic_timer nohz=off
Exit saving changes
Restart your Linux box already enjoy.
The crash of stopped and everything returns to normal.