新增技能：如何配置yum源及更新yum源列表
1，配置yum源：
进入yum源配置文件的目录
#cd /etc/apt/
备份文件
#mv
编辑文件
#vim （先删除里面的全部内容）
插入以下内容（163yum源):
deb http://mirrors./ubuntu/ trusty main restricted universe multiverse
deb http://mirrors./ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors./ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors./ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors./ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors./ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors./ubuntu/ trusty-security main restricted universe multiverse
deb-src http://mirrors./ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors./ubuntu/ trusty-proposed main restricted universe multiverse
deb-src http://mirrors./ubuntu/ trusty-backports main restricted universe multiverse
2,配置好yum源后，更新软件包列表：
apt-get update
3，期间会提示是否接受，按“y”，并回车
4，完成Ubuntu配置yum源