cant launch Windows 8 with the Ubuntu grub2 boot(the windows option doesnt work)

[Rafael Nunes]

I've just installed Ubuntu in my Windows 8 notebook, but every time i want to access my W8 with all my documents(350gb) i need to access the boot setup and prioritize the Windows boot, but then i cant access my Ubunut system without acessing the boot system and change the order of oot again back to Ubuntu

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: shim 0.4-0ubuntu4
ProcVersionSignature: Ubuntu 3.16.0-34.47~14.04.1-generic 3.16.7-ckt8
Uname: Linux 3.16.0-34-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Apr 26 13:29:22 2015
Dependencies:

InstallationDate: Installed on 2015-04-26 (0 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: shim
UpgradeStatus: No upgrade log present (probably fresh install)

[oldfred (oldfred)]

Have you tried adding this to Windows BCD with Windows bcdEdit?
bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi

Grub only works is secure boot is off. Not sure if shimx64.efi would work from Windows with secure boot on or not.

Many systems need work arounds as vendors/mfgs violate UEFI standards and use description as part of UEFI boot. And only description allowed is "Windows". In those cases another work around is to copy grubx64.efi or shimx64.efi into /EFI/Boot and rename to bootx64.efi. Then in UEFI select hard drive as boot option.

[Juksu (jluostar)]

This might be the same bug than in https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1091464.