So, Wubi + Windows 8 + UEFI = Offtopic. Noted.
Now, I don't see what of the proforma reasons apply. Do we need something like:
Wubi is not supported in Windows 8 installations using UEFI. This is by-design. If you like to install Ubuntu in a system with Windows 8, please follow Installing Ubuntu on a Pre-Installed Windows 8 (64-bit) System (UEFI Supported).
Any other idea?