[ubuntu] can't boot to Windows 8 after Ubuntu installation

If you are booting in UEFI mode, grub-efi has a bug and finds the Windows install, but thinks it still is a BIOS install and creates an incorrect BIOS boot when it should be an efi chain boot entry.

grub-update fails to detect windows bootloader on a uefi system
https://bugs.launchpad.net/ubuntu/+s...b2/+bug/807801
Wrong style chain boot entry
https://bugs.launchpad.net/ubuntu/+s...2/+bug/1024383

You can use Boot-Repair to automatically create the correct entry (or convert from BIOS Ubuntu boot to UEFI boot) or manually add a UEFI chain load entry.

You can just install into your current Ubuntu, use liveCD or USB or download a full repairCD.
Boot Repair -Also handles LVM, GPT, separate /boot and UEFI dual boot.:
https://help.ubuntu.com/community/Boot-Repair
You can repair many boot issues with this or 'Create BootInfo' report (Other Options) & post the link it creates, so we can see your exact configuration and diagnose advanced problems.Install in Ubuntu liveCD or USB or:
Full RepairCD with Boot-Repair (for newer computers)
https://help.ubuntu.com/community/UbuntuSecureRemix

Code:

menuentry "Windows 7 UEFI" {   search --file --no-floppy --set=root /efi/Microsoft/Boot/bootmgfw.efi   chainloader (${root})/efi/Microsoft/Boot/bootmgfw.efi }

So grub does not add the incorrect entries (you can turn on if reconfiguring in the future with other systems).
In /etc/default/grub I added this:
gksudo gedit /etc/default/grub
GRUB_DISABLE_OS_PROBER=true
or turn off executeable bit
sudo chmod a-x /etc/grub.d/30_os-prober

Copy above entry into 40_custom:
gksudo gedit /etc/grub.d/40_custom
Then do:
sudo update-grub

Source: http://ubuntuforums.org/showthread.php?t=2085530&goto=newpost

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