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Forked from samuelcolvin/repair_boot.md
Created September 4, 2020 21:26
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repairing boot for LUKS encrypted fs

Guides:

cryptsetup luksOpen /dev/sdb3 home_sdb3
vgchange -ay
lvscan
mkdir /media/linux
mount /dev/ubuntu-vg/root /media/linux/
mount -o bind /proc /media/linux/proc
mount -o bind /dev /media/linux/dev
mount -o bind /sys /media/linux/sys
chroot /media/linux /bin/bash
> fdisk -l:

Disk /dev/sdb: 238.5 GiB, 256060514304 bytes, 500118192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: ED00E611-2AA0-40CB-BA69-97B8FAD3303E

Device       Start       End   Sectors   Size Type
/dev/sdb1     2048   1050623   1048576   512M EFI System
/dev/sdb2  1050624   2050047    999424   488M Linux filesystem
/dev/sdb3  2050048 500117503 498067456 237.5G Linux filesystem
mount /dev/sdb2 /boot
mount /dev/sdb1 /boot/efi
grub-install /dev/sdb
**OR** grub-update

umount /boot/efi
umount /boot

leave chroot

exit 
umount /media/linux/boot/efi
umount /media/linux/boot
umount -l /media/linux
vgchange -an
cryptsetup luksClose home_sdb3
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