This suggests you should edit the file /boot/grub/menu.lst: 0.000000] ACPI: BIOS age (1999) fails cutoff (2000), acpi=force is required to enable ACPI
[ 0.000000] ACPI: Disabling ACPI support
To do so, open the file with a graphical text editor like so,
Scroll down to the section that begins: ####END DEFAULT OPTIONS####
gksu gedit /boot/grub/menu.lst
Just below that is a block of text. Look at the end of the line that begins with the word 'kernel.' Shown below.
Where I have 'lapic pci=route irq,' You likely have '--quiet splash.' Delete --quiet splash and add acpi=force
## ## End Default Options ##
title Ubuntu 8.04, kernel 2.6.24-16-generic
kernel /boot/vmlinuz-2.6.24-16-generic root=UUID=604f2b74-7f64-424f-a8bf-1160a71d9ea3 ro lapic pci=routeirq
Save the file by clicking the floppy disk image near the top of the window and reboot. It should boot considerably faster. You can then make a "profile" of the boot process, to save a few more seconds, if you like. This is done from the grub menu presented at boot...where you choose which operating system you want to boot. If you select Ubuntu, then press 'e' you will see the same block of text you have in /boot/grub/menu.lst. Use the arrow key and move to the 'kernel' line. Press e again, then move to the end of the kernel line. You will see where you have already changed the parameters to include 'acpi=force.' after that add a space and the word 'profile,' So it looks like: acpi=force profile
Hit enter and then press b to boot. This boot will take a few extra seconds while it profiles the process. Subsequent boots will be faster.