Add information for ESXi users when selecting a disk

[adx442]

In ESXi 6.7U2, the Ubuntu live environment does not show any choices in the /dev/disk/by-id section. The solution is to add:
disk.EnableUUID = true to the VMX file and reboot.

After that, the script succeeds and works perfectly. Just an info line in Readme.md or the installer would be a nice touch.

[ghfields]

Thanks. I'll make a note of this while I revamp.