Thanks for your help. Following is the contents are my /etc/fstab file
on the system.
# /etc/fstab: static file system information.
# Use 'vol_id --uuid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
/dev/mapper/debian-root / ext3 errors=remount-ro 0 1
# /boot was on /dev/sda1 during installation
UUID=6ec1a47b-3680-4136-ba36-d5542201121d /boot ext2
defaults 0 2