Linux·Ubuntu安装yum
安装常出现报错：
Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package yum
解决办法：
（1）将原本的文件内容复制一份。备份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
（2）使用如下命令打开 /etc/apt/sources.list
sudo edit /etc/apt/sources.list
（3）在 /etc/apt/sources.list第一行添加
deb http://archive.ubuntu.com/ubuntu/ trusty main universe restricted multiverse
按A键盘进入编辑状态，再添加以上内容后 按ESC键盘退出编辑状态 再输入 :wq 保存退出编辑
（4）重新运行命令
sudo apt-get update
（5）执行安装yum的命令
sudo apt-get install yum
可能遇到的问题：(缺少包)
The following packages have unmet dependencies:
yum : Depends: python-libxml2 but it is not going to be installed
Depends: python-rpm but it is not going to be installed
Depends: python-sqlite but it is not going to be installed
Depends: python-sqlitecachec but it is not going to be installed
Depends: python-urlgrabber but it is not going to be installed
E: Unable to correct problems, you have held broken packages.解决办法：
缺少什么安装什么
例：
sudo apt-get install python-sqlitecachec
sudo apt-get install python-urlgrabber
安装完后 重复第4步骤 继续安装
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