Hi Didi, I finally figured it out: Cinnamon pulls python3 as a dependency. The otopi script from the ovirt-host-deploy.tar that gets transferred from the management engine to the host-to-add prefers python3 using this logic in otopi-functions.py: get_otopi_python() { for p in "python3" "python" do pyexec=$(find_otopi ${p}) if [ -n "${pyexec}" ]; then echo "${pyexec}" break fi done } but on CentOS 7 there are no Python3 site-packages where CentOS 8 will be all dnf and python3 I guess. That means rpmUtils cannot be imported and causes the initialization of miniyum to fail. With Python3 becoming standard in CentOS 7.7 this could be come a more frequent issue. That was hard to track down, but yes, in the end the source code helped and then the fact that the otopi scipt could be executed stand-alone. I will file a bug report and perhaps the documentation could be updated to include a Python3 warning. Thanks for your support, Thomas