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Script to restore Grub2 for openSUSE after for example Windows installation.
# openSUSE rescue system login: root
fdisk -l
mount /dev/sda5 /mnt # assume that linux partition (/) is on /dev/sda5, you can see this after "fdisk -l" command
mount --bind /dev /mnt/dev
mount --bind /sys /mnt/sys
mount --bind /proc /mnt/proc
chroot /mnt
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-install /dev/sda
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