On Sat, 24 Apr 2021, Chris Murphy wrote:
You need to use -B to bind mount the pseudo filesystems, and probably also need to include /sys
grub2-install /dev/sda
mount /dev/sda3 /mnt/a3 # already done mount -B /proc /mnt/a3/proc mount -B /dev /mnt/a3/dev mount -B /dev/pts /mnt/a3/dev/pts mount -B /sys /mnt/a3/sys
chroot /mnt/a3
grub2-install /dev/sda mount /var # grub2-mkconfig wants it grub2-mkconfig > /boot/grub2/grub.cfg exit # out of chroot?
reboot