Wubi for 14.10 now recognizes and prevents installing on computers with EFI firmware. This saves those users from going through the entire installation and ending up with an obscure
wubildr.mbrerror. That's good and it's my patch that has finally been promoted after a 1.5 year delay (for unknown reasons).
The bad news is that Wubi no longer works for computers with BIOS firmware either, but you'll have to go through the entire installation to find out. This seems to be due to a
libpartedissue in the latest version of
ubiquity(Ubuntu's main installer).
So, as per my previous advice... avoid Wubi. But if you must use it, don't use 14.10's Wubi and instead see my previous post on how to install 14.04.1 Wubi.