Same bug here: I'm running Kubuntu 15.10 and I can't boot Windows10.
If I pick Windows10 entry in the grub menu selection I obtain the same message 
error written in the first post: "Invalid EFI file path".

apt-cache policy grub-efi
grub-efi:
  Installato: 2.02~beta2-29ubuntu0.3
  Candidato:  2.02~beta2-29ubuntu0.3
  Tabella versione:
 *** 2.02~beta2-29ubuntu0.3 0
        500 http://it.archive.ubuntu.com/ubuntu/ wily-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     2.02~beta2-29ubuntu0.2 0
        500 http://security.ubuntu.com/ubuntu/ wily-security/main amd64 Packages
     2.02~beta2-29 0
        500 http://it.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages

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https://bugs.launchpad.net/bugs/1024383

Title:
  update-grub generates only BIOS based menu entries for Windows, even
  on UEFI systems

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