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I installed triple boot Windows 7, Red Hat 5.5, and Ubuntu, but it's not showing Red Hat. It only shows Windows 7 and Ubuntu at booting time.

Can you please hep me out?

Thank you.

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Can you update your question to include system specs, especially what boot manager you are using. –  nbm Sep 28 '13 at 4:41
    
@nbm You mean boot-loader? Its tagged grub2. –  AsheeshR Sep 28 '13 at 6:05
    
Try sudo update-grub from Ubuntu. Then, reboot. –  AsheeshR Sep 28 '13 at 6:06
    
Yes, GRUB is a boot loader and boot manager. However, I triple-boot on a Mactel and I find that using a separate boot manager (rEFInd) makes switching between OS a lot easier. The OP doesn't mention any problems on install, only not seeing the Red Hat option at startup; a separate boot manager (on top of GRUB) might help with this. But I'm not familiar with triple-booting on DOS boxes, so maybe not. Hopefully the suggestion to simply update grub will work. –  nbm Sep 29 '13 at 19:39
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2 Answers 2

If RedHat installed with LVM you need to install the lvm2 drivers in Ubuntu and mount the RedHat partition before running sudo update-grub.

sudo apt-get install lvm2
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Add a boot entry for your RedHat partition by editing /boot/grub/grub.cfg file on Ubuntu.
The run the command sudo update-grub.

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