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.

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https://bugs.launchpad.net/bugs/1448707

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

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