not able to boot both ubuntu and centOS

[swathiep2009]

hi,
initially i was using ubuntu-9.10 and recently i installed centOS. now, i m not able to boot ubuntu, only centOS is getting booted, this is the content of my /boot/grb/grub.conf in centOS:
title CentOS (2.6.18-164.11.1.el5)
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-164.11.1.el5 ro root=LABEL=/ rhgb quiet
initrd /boot/initrd-2.6.18-164.11.1.el5.img
title CentOS (2.6.18-164.el5)
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-164.el5 ro root=LABEL=/ rhgb quiet
initrd /boot/initrd-2.6.18-164.el5.img
title two
rootnoverify (hd0,4)
chainloader +1
title three
root (hd0,5)
kernel /boot/vmlinuz-2.6.31-14-generic ro root=LABEL=/
initrd /boot/initrd.img-2.6.31-14-generic
title one
rootnoverify (hd0,3)
chainloader +1

can some body please help me out to boot both ubuntu and centOS.

[devils casper]

Hi and Welcome !

title three is referring to Ubuntu Kernel. What happens when you select three title in GRUB menu? Any error message?

Boot up CentOS and execute fdisk -l command in Terminal.

su -
/sbin/fdisk -l

Post output here.
* Its small L in fdisk -l.

[swathiep2009]

i executed the command, this is the output i got:

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 5606 45030163+ 83 Linux
/dev/sda2 5607 5737 1052257+ 82 Linux swap / Solaris
/dev/sda4 5738 9729 32065740 5 Extended
/dev/sda5 5738 5986 2000061 82 Linux swap / Solaris
/dev/sda6 5987 9729 30065616 83 Linux

[devils casper]

There is no need to create more than one SWAP partition. You can share single SWAP partition in multiple distros.

What error does machine throw on selecting three title in GRUB Menu?

[swathiep2009]

Booting 'three'

root (hd0,5)
FileSystem type is ext2fs, partition type 0x83
kernel /boot/vmlinuz-2.6.31-14-generic ro root=LABEL=/

Error 2: Bad file or directory type

[devils casper]

Something is wrong with Partition structure. Did you shrink Ubuntu partition and create new partition for CentOS?
Boot up CentOS and mount /dev/sda6 partition. Post the contents of /etc/fstab file here.

su -
mkdir /media/ubuntu
mount /dev/sda6 /media/ubuntu
less /media/ubuntu/etc/fstab

[swathiep2009]

this the output for /etc/fstab after mounting ubuntu,

/etc/fstab: line 1: /: is a directory
/etc/fstab: line 2: tmpfs: command not found
/etc/fstab: line 3: devpts: command not found
/etc/fstab: line 4: sysfs: command not found
/etc/fstab: line 5: proc: command not found
/etc/fstab: line 6: swap: command not found
/etc/fstab: line 7: /dev/sda5: Permission denied

[devils casper]

It looks like you haven't executed correct command to list contents of /etc/fstab file.
Did you execute this

less /media/ubuntu/etc/fstab

?

[swathiep2009]

this is the output for the command less /mnt/ubuntu/etc/fstab

# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s 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
# / was on /dev/sda6 during installation
UUID=3d0db99a-91c6-44c1-b394-bbe14c3c6035 / ext4 errors=remount-ro 0 1
# swap was on /dev/sda5 during installation
UUID=de06f455-8171-42ad-8315-47d8c3f8b7bf none swap sw 0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0

[devils casper]

GRUB2 start counting of partition from 1 instead of 0. /dev/sda6 is root partition. Replace (hd0,5) with (hd0,6) in title three block.

title three
root (hd0,6)
kernel /boot/vmlinuz-2.6.31-14-generic ro root=LABEL=/
initrd /boot/initrd.img-2.6.31-14-generic