Temporarily access NixOS with encrypted LUKS from Ubuntu Live


  • Boot Ubuntu Live as usual
  • Change keyboard layout with setxkbmap <lang>
  • Install useful packages with sudo apt install vim nix-bin

Open crypt device

  • Idenitify LUKS device with lsblk --fs. Look for crypto_LUKS:
    ├─nvme0n1p1   vfat        FAT32
    └─nvme0n1p2   crypto_LUKS 2
  • Open encrypted device with cryptsetup luksOpen /dev/<root partition (sda2 or similar)> secure
  • Check sucessfull open with lslbk. You should now see the crypt partition(s):
    nvme0n1       259:0    0 476.9G  0 disk
    ├─nvme0n1p1   259:1    0   549M  0 part
    └─nvme0n1p2   259:2    0 476.4G  0 part
    └─enc-pv    253:0    0 476.4G  0 crypt
      ├─vg-swap 253:1    0    16G  0 lvm
      └─vg-root 253:2    0 460.4G  0 lvm

Mount partitions

  • lvchange -a y /dev/vg/swap
  • lvchange -a y /dev/vg/root
  • mount /dev/vg/root /mnt
  • mount /dev/<boot partition (sda1 or similar)> /mnt/boot
  • swapon /dev/vg/swap

Temporarily access NixOS

  • Access with nixos-enter
  • Optional:
    • Add additional channel if needed
      nix-channel --add https://github.com/NixOS/mobile-nixos/archive/refs/heads/master.tar.gz mobile-nixos
    • Update channels nix-channel --update
  • Change config
  • Rebuild system nixos-rebuild boot

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