NVME hdd
somewhat recent (2020) MSI mobo
- In Windows, go to the menu.
- Search for Command Prompt, right click on it to run it as administrator.
- In here, copy paste the command: bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi
- Restart and you’ll be welcomed by the familiar Grub screen.*
*Note Step 4 produced no visible change until in BIOS, changed disk to be first bootable.
Reference:
https://askubuntu.com/questions/844490/no-grub-after-installing-ubuntu-beside-windows-10