So is there some sort of conversion in the initrd converting from the UUId to something conventional like /dev/sdb2, and if so why doesn't just substituting /dev/sdb2 not work.

2009/9/19 Tony Nelson <tonynelson@georgeanelson.com>
On 09-09-19 07:57:03, James Allsopp wrote:
> ... I don't really understand why it's using the UUID, ...

Because the GRUB stanza you copied to boot F11 says:

   root=UUID=7ba6f364-68c2-4dad-a54e-18c3464b0eb5

That is, it says root is identified by its UUID.

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