Error trying to resize encrypted partition

General system
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Okay, here is what I did to relocate 3 uefi systems recently, which were on single luks partitions. I use swap files not swap partitions.

Use gparted to create your new partition of the correct size. Lets assume new root partition is /dev/sdb1 going forward.

Luks encrypt your partition.

sudo cryptsetup -y -v --type luks1 luksFormat /dev/sdb1

NOTE :

Until recently grub didn’t support containers of type luks2, so I used to create luks1 containers for my root partitions. I think this has changed now and grub now supports luks2. You can remove --type luks1 if you wish.

Open luks container, create filesystem, which in my case is ext4.

sudo cryptsetup open /dev/sdb1 luksroot
mkfs.ext4 /dev/mapper/luksroot

Mount the new file system.

sudo mount /dev/mapper/luksroot /mnt

When using rsync to copy an entire system exclude these directories. Create file rs-exclude.txt containing.

/dev
/tmp
/sys
/proc

Use rsync to copy the contents of / to /mnt.

sudo rsync -av --exclude-from=rs-exclude.txt / /mnt

The rsync -a flag (ie archive) will preserve file permissions and attributes.

To make this new system chroot-able.

sudo mkdir /mnt/dev
sudo mkdir /mnt/proc
sudo mkdir /mnt/sys
sudo mkdir /mnt/tmp

Get the UUIDs for your new luks partition and file system.

lsblk -f

Edit /mnt/etc/crypttab and replace any old UUIDs with new UUIDs.
Edit /mnt/etc/fstab and replace any old UUIDs with new UUIDs.
Edit /mnt/default/grub and replace old UUIDs with new UUIDs.

Double check these, if they are incorrect your system won’t boot.

Now chroot into your new system.

sudo arch-chroot /mnt

Mount your efi partition from within chroot shell.

sudo mount /dev/sdXX /boot/efi

Re-install grub on new system from within chroot.

sudo grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=EndeavourOS --recheck

Check your efi boot order.

efibootmgr

Re-order if necessary as EndeavourOS will now be first in boot order.

efibootmgr -o [XXXX,YYYY,ZZZZ]

You should also be able to do this from BIOS, but I don’t know your machine.

Regenerate initramfs images and update grub within chroot.

sudo mkinitcpio -P
sudo update-grub

Reboot.

Practice this in a VM first, multiple times, make any mistakes there.

I cannot stress this enough.

This is what I did before attemping this process on my actual system, which subsequently went smoothly as I followed a process I knew worked.

This process is also useful for cloning systems, migrating systems onto a different file system (ie ext4 → btrfs) without re-installing, moving systems onto different drives without re-installing, failsafe luks root paritition resizing … etc.

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