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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1024383 Title: update-grub generates only BIOS based menu entries for Windows, even on UEFI systems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1024383/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs