Problem solved by a generous EriC^^ in the ubuntu IRC channel!
The solution was to boot from a live usb and mount the sda1 partition on my internal drive:
Code:
sudo mount /dev/sda1 /mnt && ls -lR /mnt/efi
In my /dev/sda1 partition I had efi/BOOT and efi/ubuntu directories. I added /efi/microsoft/boot, and copied copied the shimx64.efi and grubx64.efi files into /efi/microsoft/boot/:
Code:
sudo mkdir -p /mnt/efi/microsoft/boot && sudo cp /mnt/efi/ubuntu/shimx64.efi /mnt/efi/microsoft/boot/bootmgfw.efi && sudo cp /mnt/efi/ubuntu/grubx64.efi /mnt/efi/microsoft/boot/grubx64.efi
Thanks again to EriC^^ !!!
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