fix GRUB missing in Windows/Linux dual-boot

Open a command prompt with elevated rights (run as admin) and run:

bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi

To restore to previous settings run:

bcdedit /deletevalue {bootmgr} path \EFI\ubuntu\grubx64.efi delete grub boot

bcdedit /set {bootmgr} path \EFI\Microsoft\Boot\bootmgfw.efi set windows boot

Modify boot order

Method 1: from the Terminal

• sudo gedit /etc/default/grub
• edit order and save the file
• sudo update-grub

Method 2: Install Grub Customizer

• sudo add-apt-repository ppa:danielrichter2007/grub-customizer
• sudo apt-get update
• sudo apt-get install grub-customizer
• after the install edit the order