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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