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I found the cause. /boot/grub/grub.cfg was overwritten by update-grub. Therefore, I fixed this by replacing the file with the original copy which is from a cleanly installed OP3.
I broke the boot loader of the Linux and fixed it with super-grub2, grub-install /dev/sda, and update-grub.
However, this reset the grub setting, so the NUC shows the OS selection menu.
How can I kill the OS selection menu? I compared /etc/default/grub with the original copy, but there is no diff between the two files.
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