Also on Debian based systems
Also on Debian based systems
Posted Jul 30, 2020 21:43 UTC (Thu) by hmh (subscriber, #3838)In reply to: Also on Debian based systems by leromarinvit
Parent article: Grub2 updates for Red Hat systems are making some unbootable
The correct command on Debian/Ubuntu, for EFI systems, is just "grub-install", and let it auto-detect what it should do. Unless you unmounted /boot/efi and removed its definition in /etc/fstab, in which case you're on your own. Do yourself a favor and ensure /boot and boot/efi are mounted read-write first. Feel free to change them back to a much safer read-only afterwards, though.
I have no idea where that /dev/sda in the wiki came from. It is never right for an EFI install, hopefully grub-install will ignore it, because if it doesn't, well, the result won't be pretty.
Heck, you don't tell anyone to grub-install /dev/sda *even* for grub-pc (the "PC BIOS" edition), you say something like /dev/<boot device>...
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