Hi, Unfortunately, I can reproduce here :
[root@dev7246 ~]# yum clean all Loaded plugins: priorities, protectbase, security Cleaning repos: IRFU-IGTF irfu-epel irfu-local irfu-nagios irfu-puppet irfu-puppet-deps irfu-sl irfu-sl-fastbugs irfu-sl-java irfu-sl-java-security : irfu-sl-security frontier-squid-cern quattor-pakiti Cleaning up Everything [root@dev7246 ~]# yum -y groupinstall Core 2>&1 |tail -2 Warning: Group core does not have any packages. No packages in any requested group available to install or update [root@dev7246 ~]# yum grouplist hidden|egrep 'Groups|Core' Installed Groups: Installed Language Groups: Available Groups: Core Available Language Groups: (You'll notice we replaced all repositories with our local mirrors) I the mean time, I reinstalled the node for a demo, but the behavior remained after the reinstall. Regards De : Pat Riehecky [mailto:riehe...@fnal.gov] I'm not able to replicate that behaviour. Can I have you run a 'yum clean all' and try again? Pat -- Pat Riehecky Scientific Linux developer http://www.scientificlinux.org/