[ubuntu] Invalid Signature/No Such Device when Dual-booting with Windows 7

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http://ubuntuforums.org – Hello, I've searched for days looking for an answer but have been unable to find anything that works - although several people have reported similar situations. I recently bought a laptop which came pre-loaded with Windows 7, and I want to have it dual-booted with Ubuntu 12.04 LTS. The laptop has two separate hard drives. Windows 7 is loaded into the MBR of the first hard drive, and I've loaded Ubuntu 12.04 LTS onto the second hard drive, with a separate boot partition on the second hard drive. However, after installing Ubuntu, the Grub2 (v1.99) gives the following error whenever I (Hardware)