Disk drive for /boot is not ready yet or not present?

fter a long gap,I am back to Ubuntu from Fedora and I am really impressed by the pleasing interface ‘Lucid Lynx’ comes up with.
After installing Windows XP ,I installed Ubuntu 10.04.The installation process was smooth.But the problem I faced when I restarted the system is, at the splash startup screen.It said ,
The disk drive for /boot is not ready yet or not present.
Continue to wait, press S to skip or M for manual recovery.
I waited for a long time and it is of no use.so I skipped the process and edited some file to mount it automatically.
here is what I did,

1.Open your terminal by ctrl+alt+t or Applications –> Accessories –> Terminal

2.use the below command in terminal,

gksudo gedit /etc/fstab

3.A file will open,find /boot line.It will look something like this ,

/dev/sda2 /boot ext4 defaults 0 0

4.Now open another terminal and use the below command ,

ls -l /dev/disk/by-uuid

5.Now find the UUID for /dev/sda2 and replace the below line in fstab ,

/dev/sda2 /boot ext4 defaults 0 0

as

UUID=a647ea33-74ee-4123-84bf-7edc32e2e39b /boot ext4 defaults 0 0

[Replace the UUID number with your number]

6.save the file and restart the system.It will work fine.The same solution can be addressed for /dev/sda mounting problem.