Hi,
Ive just issued 'sudo apt-get update && sudo apt-get upgrade', and it failed badly with:
update-initramfs: Generating /boot/initrd.img-4.14.0-3-amd64 E: busybox or busybox-static, version 1:1.22.0-17~ or later, is required but not installed update-initramfs: failed for /boot/initrd.img-4.14.0-3-amd64 with 1.
To fix it I had to manually install busybox-initramfs.
Thx.