SHOW:
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| 1 | # Reference | |
| 2 | # https://help.ubuntu.com/community/Grub2 | |
| 3 | # https://help.ubuntu.com/community/Grub2/Installing | |
| 4 | # https://ubuntuforums.org/showthread.php?t=2147295 | |
| 5 | # https://blog.heckel.io/2017/05/28/creating-a-bios-gpt-and-uefi-gpt-grub-bootable-linux-system/ | |
| 6 | ||
| 7 | # Define variables | |
| 8 | export chrtdev_device=/dev/<my dev> | |
| 9 | export chrtdev_root=/dev/<root partition> | |
| 10 | export chrtdev_boot=/dev/<boot partition> | |
| 11 | export chrtdev_efi=/dev/<efi esp partition> | |
| 12 | export chrtdir=/media/chrt | |
| 13 | ||
| 14 | # Ensure efivars are present | |
| 15 | modprobe efivars | |
| 16 | ||
| 17 | # Create mounts for chroot | |
| 18 | sudo mkdir -p $chrtdir | |
| 19 | ||
| 20 | sudo mount ${chrtdev_root} $chrtdir
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| 21 | sudo mount ${chrtdev_boot} $chrtdir/boot
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| 22 | sudo mount ${chrtdev_efi} $chrtdir/boot/efi
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| 23 | - | sudo mount --bind /sys $chrtdir/sys |
| 23 | + | |
| 24 | sudo mount --bind /dev $chrtdir/dev | |
| 25 | sudo mount --bind /dev/pts $chrtdir/dev/pts | |
| 26 | sudo mount --bind /proc $chrtdir/proc | |
| 27 | sudo mount --bind /sys $chrtdir/sys | |
| 28 | sudo mount --bind /sys/firmware/efi/efivars $chrtdir/sys/firmware/efi/efivars | |
| 29 | ||
| 30 | # networking | |
| 31 | sudo cp $chrtdir/etc/resolv.conf{,.orig}
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| 32 | sudo cp /etc/resolv.conf $chrtdir/etc/ | |
| 33 | ||
| 34 | # enter chroot | |
| 35 | sudo chroot $chrtdir /bin/bash -c "chrtdev_device=${chrtdev_device}; echo \${chrtdev_device}; bash"
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| 36 | ||
| 37 | # update apt, install grub if required | |
| 38 | apt update | |
| 39 | apt install grub-efi-amd64 | |
| 40 | ||
| 41 | # install grub | |
| 42 | grub-install -v ${chrtdev_device}
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| 43 | update-grub | |
| 44 | ||
| 45 | # Restore original resolve.conf | |
| 46 | cp $chrtdir/etc/resolv.conf{.orig,}
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| 47 | ||
| 48 | # exit chroot | |
| 49 | exit |
