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[ubuntu] grub 2 "invalid signature" chainloader CentOS 6

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http://ubuntuforums.org – Hello All, I am trying to triple boot a system with Ubuntu 11.10, Windows 7, and CentOS 6.2. I am able to boot into each one using os_probe. What I am trying to do is chainload CentOS 6.2 so that I may update kernels and not have to boot into Ubuntu to run update-grub2. I was looking at the configuration for Windows 7 and it seems it is using chainloader to boot the Windows boot loader. I copied this config changing the drive location and insmod from ntfs to ext2 but when I try to load I get invalid signature error message. I have done some google searches and tried many thing which hav (Hardware)