Whonix live mode / amnesia / amnesic / non-persistent / anti-forensics

Dependency on initramfs-tools is declared here.

I wonder if we could remove it? VirtualBox guest additions probably needs update-initramfs (dunno if it works with dracut equivalent if ther is any? Might be better to make initramfs-tools a weak recommended package. (Meaning we apt-get install it during Whonix build, but don’t have some Whonix meta package depend on it.)