Hello Fabian and Thomas, I think bug #12169 might have been closed prematurely (again). The reported issue is that %addon sections are ignored by CBS, not that we need to upgrade our infra to CentOS Linux 7 (that was just what we initially thought to be enough to avoid the problem). The problem was that pykickstart had no support for %addon sections, and it removed any unknown section from generated file. I reported this upstream a while ago, and Chris Lumens added a workaround 12 days ago. [2] Could we incorporate the two upstream commits into our .srpm and let me test it first, please? :) Thanks, Laurențiu [1] https://bugs.centos.org/view.php?id=12169 [2] https://github.com/rhinstaller/pykickstart/issues/154#issuecomment-314172112