Lunux/Ubuntu not booting up after the kernel update?

After I have upgraded to 2.6.38-9-generic kernel I got the following message and I have tried many thing but this is how I have solved the problem.

Gave up waiting for root device. Common problems:
-Boot args (cat /proc/cmdline)
-Check rootdelay= (did the system wait long enough?)
-Check root= (did the system wait for the right device?)
-Missing modules (cat /proc/modules; ls /dev)
ALERT! /dev/disk/by-uuid/310147a9-f21c-4e7c-aeb0-18f31073da58 does not exist. Dropping to a shell!

BusyBox v1.10.2 (Ubuntu 1:1.10.2-2ubuntu7) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)

Boot your computer and when the grub loader appears, select the linux version you use (to the rescue mode) and press 'e' to edit it.

Then remove the the UUID= part of the line from root=UUID=

Replace it with your current partition, so in my case it looks like

root=/dev/sda5

press +x to boot up with the changed settings

Then after you have logged in install fglrx module.

sudo apt-get install fglrx

Then restart.

Now this time select your linux version but this time not the rescue mode.

Then replace the UUID how you did earlier.

Done.

To permanently apply the settings to grub, you will have to edit the grub.cfg file

sudo vi /boot/grub/grub.cfg