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My desktop was tri-booting between Ubuntu 2.04, CentOS 6, and Windows. I installed CentOS 7 in the space that CentOS 6 used, but update-grub doesn't result in the new CentOS showing up. I can only think there's some issue with the version or the way LVM is used by CentOS 7 that Ubntu doesn't agree with. Any thoughts?

  • Does your GRUB maybe detect a RedHat entry? Just wondering as I think the /etc/lib/os-probes/mounted/90linux-distro file reads for OSes with /etc/redhat-release which is what CentOS has. – Terrance Feb 13 '16 at 4:40
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CentOS 7 uses grub2. Ubuntu 12.04 uses grub. I used the CentOS DVD to install grub2 on the boot partition, and all is well!

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