Boot error

Try the following:

1) Open a terminal (Applications->Accessories->Terminal)
2) Run the following command:

gksudo gedit /boot/grub/menu.lst

3) Gedit should open after you put in your password. Scroll to the bottom of the final until you see the first operating system entry. It should look something like this:

## ## End Default Options ##

title Ubuntu 9.04, kernel 2.6.28-13-generic
uuid 8d96f1c1-2234-4069-8701-1af5e067057e
kernel /boot/vmlinuz-2.6.28-13-generic root=UUID=8d96f1c1-2234-4069-8701-1af5e067057e ro quiet splash
initrd /boot/initrd.img-2.6.28-13-generic
quiet

4) At the end of the "kernel" line add the word: irqpoll so that it looks like something like this:

## ## End Default Options ##

title Ubuntu 9.04, kernel 2.6.28-13-generic
uuid 8d96f1c1-2234-4069-8701-1af5e067057e
kernel /boot/vmlinuz-2.6.28-13-generic root=UUID=8d96f1c1-2234-4069-8701-1af5e067057e ro quiet splash irqpoll
initrd /boot/initrd.img-2.6.28-13-generic
quiet

5) Save and close the file.
6) Reboot. If the problem is gone. Do the following:

a) Open a terminal (Applications->Accessories->Terminal)
b) Run the command:

gksudo gedit /boot/grub/menu.lst

c) Find the line that says:

# defoptions=quiet splash

d) Add irqpoll to this line:

# defoptions=quiet splash irqpoll

e) Save and close the file.
f) Run this command at the terminal:

sudo update-grub

Thanks for your response Steven. I followed your steps and added irqpoll parameter. But it didn't solve my problem.

Hi. Since the irqpoll didn't work, you may want to remove that edit from your /boot/grub/menu.lst file.

Do you know if what you are experiencing has anything to do with this bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/305724

People in that bug report claim to have received the same error.

Hi. I looked to that bug report, but I couldn't figure out anything.

The problem is solved by updating the firmware of my DVD Drive.