Command not found: mount

[stellessia]

Hello, I've decided to install NixOS using disko-install but encounter a critical error.

I've used the default LUKS + BTRFS template listed in the repository (https://github.com/nix-community/disko/blob/master/example/luks-btrfs-subvolumes.nix) and I've been doing that on non-NixOS live CD with /nix and /mnt/disko-install mounted from RAM

Once disko-install maps the drive, copies /nix/store, and sets up LUKS, right after "Setting up /etc" the script throws the following error:

/nix/var/nix/profiles/system/sw/bin/bash: line 10: mount: command not found

Which likely indicates a missing dependency.

What can be the issue?

[stellessia]

The only file that has "mount" on the line 10 is the disko itself

#!/usr/bin/env bash
set -euo pipefail

readonly libexec_dir="${0%/*}"

# a file with the disko config
declare disko_config

# mount was chosen as the default mode because it's less destructive
mode=mount

I still can't understand what's the issue because it seems that it's just a simple variable. Tried searching with "#! AND mount" argument, nothing else pops