: Kernel panic - not syncing: VFS: Unable to nount root fs

[Ming Kbot]

Help !

I'm new to linux ..

i cant boot Kubuntu. ( normally )

when i go into grub menu selecting 
Ubuntu 9.04, kernel 2.6.28-14-generic gives a error and stops.

The error reads: Kernel panic - not syncing: VFS: Unable to nount root fs on 
unknown-block(0,0)

when I select Ubuntu 9.04, kernel 2.6.28-13-generic boots normally

I've run fsck and the disk checker on the Ubuntu DVD  they found 1 bad block 
and fixed it.

can i run 13 and force it to update to 14 again ? 

please help !