Got this error when trying to upgrade to virtualmin pro from the gpl interface:
Loading "installonlyn" plugin Error: Need to pass a list of pkgs to install usage: yum [options] < grouplist, localinstall, groupinfo, localupdate, resolvedep, erase, deplist, groupremove, makecache, upgrade, provides, shell, install, whatprovides, groupinstall, update, groupupdate, info, search, check-update, list, remove, clean, grouperase >
options: -h, --help show this help message and exit -t, --tolerant be tolerant of errors -C run entirely from cache, don't update cache -c [config file] config file location -R [minutes] maximum command wait time -d [debug level] debugging output level -e [error level] error output level -y answer yes for all questions --version show Yum version and exit --installroot=[path] set install root --enablerepo=[repo] enable one or more repositories (wildcards allowed) --disablerepo=[repo] disable one or more repositories (wildcards allowed) -x [package], --exclude=[package] exclude package(s) by name or glob --obsoletes enable obsoletes processing during updates --noplugins disable Yum plugins None .. done