"by_uuid" and "33e3e/e4" are typo, are not they?
Originally Posted by ezhilRaj
If they are not typo, correct the line in /boot/grub/grub.cfg or /boot/grub/menu.lst, so that root partition is correctly mounted at boot time.
As is written in above #3 and #4, file system check (and repair) by "fsck" may solve your problem.
Or you may need some modules to mount your root partition. If so, incorporate them into initramfs (initrd).
You can boot with Ubuntu live cd and "chroot" and add the necessary module names in /etc/initramfs-tools/modules and execute "update-initramfs".
For details, execute