Turns out some Docker base images (eg. ubuntu:18.04) don't include it, so we have to drag it in manually. It's a crazy world we live in these days :) Andrea Bolognani (2): guests: Add mapping for modprobe guests: Install modprobe for libvirt guests/vars/mappings.yml | 4 ++++ guests/vars/projects/libvirt.yml | 1 + 2 files changed, 5 insertions(+) -- 2.20.1