[ubuntu] Grub install failed, how to add new Ubuntu install?

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http://ubuntuforums.org – I just installed a fresh Ubuntu (12.04 I think, currently running 10.04) onto a new partition (formatted with btrfs) but the end of the installation gave me a Grub could not be installed error. So I went about adding it manually using this guide: http://linuxnorth.wordpress.com/2011...ub2-revisited/ which involves editing the grub.cfg via the 40_custom file and running update-grub. After running said command, the update works but only adds everything but my new install, leaving me with an identical grub.cfg as before. My custom grub cfg (has the new install added under 10_linux, I've hig (Hardware)