os-prober does not detect Windows 8.

[Sergey]

Fresh installation of Ubuntu alongside with pre-existing Windows8 on ASUS U500VZ notebook, SSD RAID. Can't achieve boot to Windows from GRUB while UEFI boots both systems no problems.

$ sudo os-prober
/dev/mapper/isw_bhiiigeffb_RAID0SYS7:Ubuntu 14.04.1 LTS (14.04):Ubuntu:linux

does not see Windows.

boot-repair sees Windows, but asks to disable Security Boot feature that doesn't seem to be possible on this EFI implementation.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: os-prober 1.63ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jul 29 21:49:48 2014
Dependencies:
 gcc-4.9-base 4.9-20140406-0ubuntu1
 libc6 2.19-0ubuntu6
 libgcc1 1:4.9-20140406-0ubuntu1
 multiarch-support 2.19-0ubuntu6
InstallationDate: Installed on 2014-07-29 (0 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: os-prober
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Vasya Pupkin (shadowlmd)]

Same issue here on ASUS Zenbook UX301LAA with SSD Raid. For some reason os-prober ignores Windows Boot Manager EFI partition. Looks like the real problem is the EFI test. Here's a syslog entry after running os-prober:

Jun 7 00:00:17 shadow-zenbook os-prober: debug: running /usr/lib/os-probes/mounted/05efi on mounted /dev/mapper/isw_dahhdhgec_ASUS_OS1
Jun 7 00:00:17 shadow-zenbook 05efi: debug: /dev/mapper/isw_dahhdhgec_ASUS_OS1 is a FAT32 partition
Jun 7 00:00:17 shadow-zenbook 05efi: debug: /dev/mapper/isw_dahhdhgec_ASUS_OS1 is virtual device: exiting

[Vasya Pupkin (shadowlmd)]

Commenting out "virtual" test in /usr/lib/os-probes/mounted/05efi fixed the problem. Here's an output from os-prober after change:

$ sudo os-prober
/dev/mapper/isw_dahhdhgec_ASUS_OS1@/EFI/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi
/dev/mapper/isw_dahhdhgec_ASUS_OS7:Ubuntu 15.04 (15.04):Ubuntu:linux

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "05efi.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Vasya Pupkin (shadowlmd)]

Bug is still present in Ubuntu 15.10.

[Vasya Pupkin (shadowlmd)]

Still an issue with Ubuntu 16.04. FFS.

[Vasya Pupkin (shadowlmd)]

Is it going to be fixed? I provided a simple solution in #4, someone who created this script (or maintains it) should look into it and probably create a better solution.