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tried boot-repair. URL from that is: http://paste.ubuntu.com/14673632

thanks

NinjaJellyBean
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    HP only likes to use description to boot. And description must be Windows. But since you do not have Windows change/make description of grub2's shim file be "Windows". Run this from live installer: sudo efibootmgr -c -L "Windows Boot Manager" -l "\EFI\ubuntu\shimx64.efi" Then Boot Windows entry that is shim, not Windows files. Boot-Repair also copied shim to bootx64.efi which is a fallback or hard drive entry. I do not see that but UEFI may add it. Sony, HP & others: http://askubuntu.com/questions/486752/dual-boot-win-8-ubuntu-loads-only-win/486789#486789 – oldfred Jan 27 '16 at 21:53

1 Answers1

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Reinstall the GRUB boot loader this way :
Boot from Ubuntu installation media.
Open a terminal and execute : 

sudo mount /dev/sda2 /mnt
sudo mount /dev/sda1 /mnt/boot/efi
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
sudo chroot /mnt
grub-install /dev/sda
update-grub

Note : sda = disk | sda1 = EFI partition | sda2 = system partition

In case Ubuntu still does not boot - maybe you have to select Ubuntu as default system in BIOS, because there still is Windows boot loader (Microsoft folder) installed on the EFI partition sda1.

Byte Commander
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cl-netbox
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