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For some reasons I want to install grub2 to my Ubuntu partition(it's sda5) instead of MBR(grub2 will be chainloaded by another loader).

Unfortunately, I can't do this. When I type

sudo grub-install /dev/sda5

I get this:

Path '/boot/grub' is not readable by GRUB on boot. Installation is impossible. Aborting.

sda5 partition is already mounted. What's wrong?

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possible duplicate of GRUB fails to install on upgrade 12.04->12.10 (fakeraid) –  Ringtail Jan 23 '13 at 0:24
That's not a duplicate. I have no problems with installing GRUB to the MBR at all, the problem is to install it to a specific partition. –  Shemhamforasch Jan 23 '13 at 16:58
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