B> Read the NEWS.
"You may need
to modify /etc/initramfs-tools/initramfs-tools.conf or install busybox
when upgrading."
$ ls /etc/initramfs-tools/initramfs-tools.conf
ls: cannot access /etc/initramfs-tools/initramfs-tools.conf: No such file or directory
Maybe that means the default state will be an installation failure.