[ubuntu] GRUB not booting correctly after dual boot install

Cross posted at askubuntu (because this article told me to post here: https://help.ubuntu.com/community/UEFI)


I followed these instructions to dual boot windows 8 and ubuntu:


http://askubuntu.com/questions/22183...supported?rq=1


I was successfully able to install ubuntu. But then I couldn't boot into windows 8


"File: \Boot\BCD Status: 0xc000000c Info: the boot configuration data for your pc is missing or contains errors."


So I ran boot-repair in ubuntu.


But then when I restarted computer I get:


error: invalid arch independent ELF magic
grub rescue >


At the end of boot-repair I had this message:


Please do not forget to make your BIOS boot on sda2/EFI/ubuntu/shimx64.efi file!


I have no idea how to do that. I am able to boot into ubuntu by hitting the F12 on startup, otherwise it goes to the screen with the invalid arch error.


Here is the summary of the boot-repair: http://paste.ubuntu.com/6535680


EDIT: Still not able to boot into windows 8 from grub screen btw I get:


error: unknown command 'drivemap'.
error: invalid EFI file path.


EDIT: A few more details: when I installed ubuntu I had my BIOS set to legacy mode (not UEFI) as suggested by the article above. When I installed Ubuntu I chose the "Install Ubuntu alongside Windows 8" option.