Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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.

share|improve this question
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

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
share|improve this answer

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

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.