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Reinstall Grub2 EFI
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| su - | |
| cd /mnt | |
| mount /dev/fedora/root ./ | |
| mount -t proc proc proc/ | |
| mount --rbind /sys sys/ | |
| mount --rbind /dev dev/ | |
| mount --rbind /var/run/ var/run/ | |
| chroot /mnt/ | |
| mount /boot | |
| mount /boot/efi | |
| dnf -y install grub2 grub2-efi grub2-efi-modules shim | |
| dnf -y reinstall grub2 grub2-efi grub2-efi-modules shim | |
| grub2-mkconfig -o /boot/grub2/grub.cfg | |
| grub2-install /dev/sda | |
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