I had problems installing Ubuntu on my HP Laptop. It used to give some error related to peace bus.
I didn't understand the error, but after visiting many websites I found a solution.
The solution asked me to add a parameter "pci=nomsi" to the kernel, while boot up.
And later make it permanent by updating "/etc/default/grub".
I tried this solution and it worked fine.
But I would like to know, what is a pci bus and what did that command mean?