升級方式：光碟升級
狀況：升級後想要用yum update出現如下的錯誤訊息
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
No module named yum
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:
2.6 (r26:66714, Mar 17 2009, 11:44:21)
[GCC 4.4.0 20090313 (Red Hat 4.4.0-0.26)]
If you cannot solve this problem yourself, please go to
the yum faq at:
http://wiki.linux.duke.edu/YumFaq
解決方式：重新再安裝一次yum跟yum-utils這兩個套件
使用指令：rpm -ivh --force yum-
安裝完之後建議執行指令：yum clean all
