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I'm already on 11.10 and out of curiosity I installed 12.04 on a separate partition. But when I boot up my machine, it is going into 11.10. It doesn't show up grub menu to select which OS I want to boot into.

While installing from 12.04, I selected the option 'something else' and installed 12.04 on a separate partition.

any ideas are appreciated.

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did you try keep pressed Alt when turned on your computer? – geoh Apr 29 '12 at 10:45
up vote 1 down vote accepted

It should be quite simple. It would seem that GRUB is simply installed incorrectly.

You could first try opening a terminal and running sudo update-grub

If that doesn't solve the problem, run sudo grub-install /dev/sda (if you get an error, replace sda with hda), and then run sudo update-grub

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It worked like a charm :-) – doubledecker Apr 30 '12 at 6:37

Looks like you installed grub record of the ubuntu 12.04 onto boot sector of that separate partition.

If I am correct, then you need to chainload the boot sector of that partition (with 12.04) from MBR of the disk.

Add to the end of /etc/grub.d/40_custom the following lines and run update-grub:

for ubuntu 12.04 on sda5

title ubuntu 12.04 root (hd0,4) chainloader +1

You can also go without editing the grub files, by booting into grub menu and typing the chainloading instructions over there.

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