Hi, This commit https://github.com/openstack/diskimage-builder/commit/2854f4063bd2a6dcdb6fa5fab93aa56857e47b59 Added ExecStartPre=/usr/sbin/modprobe vfat to the ironic-python-agent systemd script The problem is that modprobe location in Ubuntu / sbin/modprobe (the /usr/sbin/modprobe vfat works for redhat) I have opened this bug in Launchpad https://bugs.launchpad.net/diskimage-builder/+bug/1658297 This break IPA element when building with Ubunut OS. Is there conditional in systemd scripts like If os == Redhat then ExecStartPre=/usr/sbin/modprobe vfat Elseif os == Ubuntu then ExecStartPre=/sbin/modprobe vfat What is the best way to fix this? Thanks, Moshe Levi