错误信息1：

There was a problem importing one of the Python modules

required to run yum. The error leading to this problem was:

No module named urlgrabber

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:

2.6.6 (r266:84292, Nov 22 2013, 12:16:22)

[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]

If you cannot solve this problem yourself, please go to

the yum faq at:

http://yum.baseurl.org/wiki/Faq

解决办法：

进入这个网址：http://urlgrabber.baseurl.org/download/

通过wget命令下载 wget http://urlgrabber.baseurl.org/download/urlgrabber-3.10.tar.gz

解压并进入该目录下执行该命令：python setup.py install

错误信息2：

Loaded plugins: fastestmirror

Error: File contains no section headers.

file: file:/etc/yum.repos.d/CentOS-Debuginfo.repo, line: 1

'eme=CentOS-6 - Debuginfo\n'

执行如下命令即可解决：

cd /etc/yum

cd yum.repos.d

mv CentOS-Debuginfo.repo CentOS-Debuginfo.repo.bak