[ubuntu] Preparing flash drive for encrypted Ubuntu installation

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http://ubuntuforums.org – Hi all, I am installing Ubuntu on a flash drive with LUKS encryption using the alternative CD. I'm confused as to whether I need to prepare/partition the flash drive beforehand. I have been generally following the guide Ubuntu Encrypted Flash Memory Installation and Method 1 of LiveUsbPendrivePersistent. When I get to the part to install GRUB, I try to install it on the first USB partition (i.e. /dev/sdb1) but the only partition it will install on is /dev/sdb. Am I missing something here? (Hardware)