I've been looking for solutions to resolve the "Invalid EFI file path" error, and I've found a dozen - changing menuentries of grub file, installing rEFInd, using boot-repair etc - but none of them worked for me.
I have an ASUS-UX31A ultrabook with Windows 7 inside. I've installed Ubuntu 12.10 alongside Windows 7. After that, I've rebooted and when I selected "Windows 7 (loader)", it appears this hell message "Invalid EFI file path".
I've tried to run boot-repair, but I think it didn't work. The error persists. Here is the log: http://paste.ubuntu.com/5608344/
My best regards,