[root@localhost ubuntu]# yum
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   /usr/lib/python2.3/site-packages/cElementTree.so: cannot open shared object file: No such file or directory

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:
2.3.4 (#1, Nov  4 2004, 14:13:38)
[GCC 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)]

If you cannot solve this problem yourself, please go to
the yum faq at:
  http://wiki.linux.duke.edu/YumFaq


[root@localhost ubuntu]# rpm -q yum
yum-2.4.3-1.c4
[root@localhost ubuntu]# rpm -q --requires yum-2.4.3-1.c4
/bin/bash
/bin/sh
/bin/sh
/bin/sh
/sbin/chkconfig
/sbin/service
/usr/bin/python
config(yum) = 2.4.3-1.c4
coreutils
libxml2-python
python
python-elementtree
python-sqlite
rpm >= 0:4.1.1
rpm-python
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
urlgrabber
yumconf
[root@localhost ubuntu]# rpm -q python
python-2.3.4-14