Comment 26 for bug 1366546

HP 19-2113w AIO desktop:

To fool HP's broken UEFI implementation, put into nvram:

sudo efibootmgr -c -L "Windows Boot Manager" -l "\EFI\Microsoft\Boot\bootmgfw.efi"

Case is not really important in a FAT filesystem. The bootmgfw.efi is the name of the original (now absent) Microsoft bootloader.

Next, set up the bootloaders. Use shimx64.efi as the bootloader. Copy it into <your mount point>/EFI/Microsoft/Boot/bootmgfw.efi (Using the foward slashes you use on a Linux system). Also, copy grubx64.efi into the <your mount point>/EFI/Microsoft/Boot directory (since shim expects it there). I usually leave the grub.cfg file in <your mount point>/EFI/ubuntu/grub.cfg. grubx64.efi will find it there.

That should be a working boot setup for secure or non secure boot . If you don't care about secure boot, you can just copy grubx64.efi into ...bootmgfw.efi

Just as a fallback, you may put another copy of shim (or grubx64.efi) into .../EFI/Boot/bootx64.efi (note name change to bootx64.efi)(and a copy of grubx64.efi there too).

Some machines will try that if the requested boot fails."

THIS WORKS FOR: HP 19-2113w AIO

In fact, I only had to create the .../EFI/Boot/ directory and populate as stated, above. I left the M$ directory completely out(tested multiple times to be sure).

Enter the BIOS, at boot, using F10 and move(drag) the 'ubuntu' entry to the top of the 'Boot Order' list for UEFI. It can get reset during a failed boot!

Also, I'm using the latest BIOS update from hp.com as of 07/13/2015.

SOURCE: http://ubuntuforums.org/showthread.php?t=2256060&page=2