File /usr/share/initramfs-tools/conf-hooks.d/cryptsetup from package
cryptsetup-initramfs seems to set BUSYBOX=y,
which then makes the first condition here (/usr/sbin/mkinitramfs) match,
> # Check busybox dependency
> if [ "${BUSYBOX}" = "y" ] && [ -z "${BUSYBOXDIR}" ]; then
> echo >&2 "E: busybox or busybox-static is required but not
installed"
> exit 1
> fi
and as var BUSYBOXDIR is expected to be set by the hook that is removed in
busybox 1.37.0-9, that breaks on all hosts that have cryptsetup-initramfs
installed.
