REF :https://linuxhint.com/ubuntu_boot_repair_tutorial/
(0)boot with Ubuntu1604 live USB disk then select the "Try Ubuntu" option.
(1) sudo add-apt-repository ppa:yannubuntu/boot-repair OK
(2-0) $sudo apt update
OK
(2-1)$ sudo apt install boot-repair
OK
(2-2) $ boot-repair
(2-2-1) select second button [Create a BootInfo summary] to generate the report on http://paste.ubuntu.com/p/vqm9SbJb6R/ (20191229UbuntuBoot-RepairReport.txt下載 )
(2-2-2) select first button [Recommended repair] to repair(20191229UbuntuBootRepairOK.txt下載 (82 KB))
An error occurred during the repair.
Please write on a paper the following URL: http://paste.ubuntu.com/p/crCG8Bs2bw/
In case you still experience boot problem, indicate this URL to: boot.repair@gmail.com
You can now reboot your computer. Please do not forget to make your BIOS boot on sda1/EFI/ubuntu/shimx64.efi file!
If your computer reboots directly into Windows, try to change the boot order in your BIOS. If your BIOS does not allow to change the boot order, change the default boot entry of the Windows bootloader. For example you can boot into Windows, then type the following command in an admin command prompt: bcdedit /set {bootmgr} path \EFI\ubuntu\shimx64.efi
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