Thanks for coming back. With greatest respect, I can see it clearly
installed here:

https://travis-ci.com/cherusk/godon/builds/144068483#L432

Probably you're right, but find the separately packaged *qemu-img
*non-intiutitive or confusing then.
**

Oh you have two installs of libvirt here. One in the Ubuntu image
that's running the job. This one lacks qemu-img. The second install
is the Docker container you've built which contains Fedora and has
qemu-img.

I can't tell which libvirt install your error is coming from, but
I'd guess the "host" Ubuntu one which lacks qemu-img

ignorant me, you're right!!! Ran also into issues for host/container libvirt pool discrepancies earlier on. Highly likely it's the host lacking qemu-img.

-- 
Friendly

Matthias