just to say that I am having the same issue here.
...
Setting up ruby2.3 (2.3.1-2) ...
Processing triggers for initramfs-tools (0.125) ...
update-initramfs: Generating /boot/initrd.img-4.5.0-2-amd64
cp: cannot stat '/etc/modprobe.d/*': No such file or directory
Processing triggers for libc-bin (2.22-9) ...
...
having same version (0.125) of initramfs-tools.