[root@fed23 pkuser]# yum There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: No module named cElementTree Please install a package which provides this module, or verify that the module is installed correctly. It's possible that the above module doesn't match the current version of Python, which is: 2.4.1 (#1, Jun 21 2005, 02:38:47) [GCC 3.4.3 20050227 (Red Hat 3.4.3-22.fc3)] If you cannot solve this problem yourself, please send this message to <yum@xxxxxxxxxxxxxxxxxxxx>.