Grub rescue unknown filesystem error

[Arun Shrimali]

Dear All,

Recently I have installed Ubuntu 10.10 on fresh system. after running
perfectly for few days, today I got the following error on boot:

error: unknown filesystem
grub rescue >


After googling I have tried the following process through live CD

 Code:

sudo fdisk -l

 It gave the details of the disk, which says that Linux is on sda1
As suggested I make the mount point and tried to mount :
Code:

sudo mount /media/sda1
sudo mount -t ext4 /dev/sda1 /media/sda1

 It gave me following error
Code:

Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sda1,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

Can anybody help me way out.

Arun
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