After Windows 10 "Creators" update the fucker removes Grub and fucks your dual boot.

instructions.txt

After Windows 10 "Creators" update the fucker removes Grub and fucks your dual boot.

To restore a Ubuntu 16.04 installation with the following characteristics:

- EFI mode.
- GPT partition table.
- One encrypted / partition.
- One /boot partition.
- One EFI partition.
- Dual boot with Windows 10.

So, first, download Ubuntu 16.04 ISO image and create a live-USB. Boot to the USB, load the Ubuntu desktop and open a terminal.

# Install Grub for EFI
sudo apt update
sudo apt install grub-efi

# Locate and mount the encrypted partition
sudo blkid | grep "crypto_LUKS"     # -> /dev/sda7
sudo udisksctl unlock -b /dev/sda7
sudo udisksctl mount -b /dev/mapper/...
sudo mount --bind /media/root/... /mnt/

# Locate and mount the boot partition
sudo blkid | grep "Grub"     # -> /dev/sda4
sudo mount /dev/sda4 /mnt/boot

# Locate and mount the EFI partition
sudo blkid | grep "EFI"     # -> /dev/sda2
sudo mount /dev/sda2 /mnt/boot/efi

# Mount the virtual file systems
sudo mount --bind /dev /mnt/dev
sudo mount --bind /dev/pts /mnt/dev/pts
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys

# Change root
sudo chroot /mnt

# Install and check
grub-install --target=x86_64-efi /dev/sda
grub-install --recheck /dev/sda

# Exit fake root
exit

# Unmount volumes and reboot
sudo umount /mnt/sys
sudo umount /mnt/proc
sudo umount /mnt/dev/pts
sudo umount /mnt/dev
sudo umount /mnt/boot/efi
sudo umount /mnt/boot
sudo umount /mnt
reboot

Now, Windows will still boot. Boot in Windows and open Command Prompt as Administrator:

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

Reboot and you should have your fucking Ubuntu back. Fuck you Windows piece of shit.