I have an Intel i5 laptop with 150Gb space and partitioned into 3 parts. Ubuntu 14.10 LTS 64-bit and Mint 17 Cinnamon 64-bit installed in 2 separate partitions. The GRUB 2 bootloader works fine.

Then I installed CentOS 6 64-bit into the third separate partition by using an USB boot drive containing CentOS 6 only. After successful installation the machine was reboot and I can only found the CentOS 6 in the GRUB bootloader. Both Ubuntu and Mint could not be loaded from the bootloader. I know that I have probably replaced the GRUB2 with GRUB.

I have reinstalled the GRUB using the CentOS 6 USB boot drive following the command of the CentOS wiki http://wiki.centos.org/TipsAndTricks/ReinstallGRUB. The rescue mode was chosen after the USB boot. I have run the command:

# chroot /mnt/sysimage

But I could not run the following scripts:

# grub-install /dev/sda
# grub-install /dev/sda2

Then I reboot the machine and only I found GRUB2 reappeared in the boot screen. However this time the CentOS 6 was gone.

Is there any way I could be able to choose all the 3 linux distros in the same boot screen? I am a newbie to linux and therefore I would like to know the reason of the above happening?


Follow that instruction step by step
Instead XY enter the letter and number for ubuntu partition

is you boot ubuntu use grub-customizer to find all OS.

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