Package: initramfs-tools-core
Version: 0.121
If I try to run update-initramfs while busybox is not installed, I get an error message:
E: busybox is required but not installed
E: /usr/share/initramfs-tools/hooks/busybox failed with return 1.
This happens irrespective of the BUSYBOX setting in /etc/initramfs-tools/initramfs.conf.