下面简单介绍以喜爱ubuntu和centos在软件包管理程序上面的区别。
Ubuntu apt 软件包管理程序，下软件包是通过apt这个程序来下载的。
Centos yum 下载软件是通过这个程序命令进行的。
下面我们安装nano
能够打开文件了，说明下载完成之后，就已经安装好了。
查看系统的版本：lsb_release -a
其实装完linux系统的第一件事请就是修改数据源，将软件仓库修改为阿里的，这样我们下载和安装软件的时候会比较快。搜搜的。
下载完了之后，更新一下apt程序 更新软件包列表
zyq@ubuntu:/etc/apt$ sudo apt-get update
Get:1 http://mirrors.aliyun.com/ubuntu xenial InRelease [247 kB]
Get:2 http://mirrors.aliyun.com/ubuntu xenial-security InRelease [109 kB]
Get:3 http://mirrors.aliyun.com/ubuntu xenial-updates InRelease [109 kB]
Get:4 http://mirrors.aliyun.com/ubuntu xenial-backports InRelease [107 kB]
Get:5 http://mirrors.aliyun.com/ubuntu xenial/main amd64 Packages [1,201 kB]
Get:6 http://mirrors.aliyun.com/ubuntu xenial/main i386 Packages [1,196 kB]
Get:7 http://mirrors.aliyun.com/ubuntu xenial/main Translation-en [568 kB]
Get:8 http://mirrors.aliyun.com/ubuntu xenial/restricted amd64 Packages [8,344 B]
Get:9 http://mirrors.aliyun.com/ubuntu xenial/restricted i386 Packages [8,684 B]
Get:10 http://mirrors.aliyun.com/ubuntu xenial/restricted Translation-en [2,908 B]
Get:11 http://mirrors.aliyun.com/ubuntu xenial/universe amd64 Packages [7,532 kB]
Get:12 http://mirrors.aliyun.com/ubuntu xenial/universe i386 Packages [7,512 kB]
Get:13 http://mirrors.aliyun.com/ubuntu xenial/universe Translation-en [4,354 kB]
Get:14 http://mirrors.aliyun.com/ubuntu xenial/multiverse amd64 Packages [144 kB]
Get:15 http://mirrors.aliyun.com/ubuntu xenial/multiverse i386 Packages [140 kB]
Get:16 http://mirrors.aliyun.com/ubuntu xenial/multiverse Translation-en [106 kB]
Get:17 http://mirrors.aliyun.com/ubuntu xenial-security/main amd64 Packages [841 kB]
Get:18 http://mirrors.aliyun.com/ubuntu xenial-security/main i386 Packages [647 kB]
Get:19 http://mirrors.aliyun.com/ubuntu xenial-security/main Translation-en [319 kB]
Get:20 http://mirrors.aliyun.com/ubuntu xenial-security/restricted amd64 Packages [7,204 B]
Get:21 http://mirrors.aliyun.com/ubuntu xenial-security/restricted i386 Packages [7,224 B]
Get:22 http://mirrors.aliyun.com/ubuntu xenial-security/restricted Translation-en [2,152 B]
Get:23 http://mirrors.aliyun.com/ubuntu xenial-security/universe amd64 Packages [487 kB]
Get:24 http://mirrors.aliyun.com/ubuntu xenial-security/universe i386 Packages [420 kB]
Get:25 http://mirrors.aliyun.com/ubuntu xenial-security/universe Translation-en [199 kB]
Get:26 http://mirrors.aliyun.com/ubuntu xenial-security/multiverse amd64 Packages [5,728 B]
Get:27 http://mirrors.aliyun.com/ubuntu xenial-security/multiverse i386 Packages [5,880 B]
Get:28 http://mirrors.aliyun.com/ubuntu xenial-security/multiverse Translation-en [2,708 B]
Get:29 http://mirrors.aliyun.com/ubuntu xenial-updates/main amd64 Packages [1,121 kB]
Get:30 http://mirrors.aliyun.com/ubuntu xenial-updates/main i386 Packages [908 kB]
Get:31 http://mirrors.aliyun.com/ubuntu xenial-updates/main Translation-en [427 kB]
Get:32 http://mirrors.aliyun.com/ubuntu xenial-updates/restricted amd64 Packages [7,616 B]
Get:33 http://mirrors.aliyun.com/ubuntu xenial-updates/restricted i386 Packages [7,580 B]
Get:34 http://mirrors.aliyun.com/ubuntu xenial-updates/restricted Translation-en [2,272 B]
Get:35 http://mirrors.aliyun.com/ubuntu xenial-updates/universe amd64 Packages [795 kB]
Get:36 http://mirrors.aliyun.com/ubuntu xenial-updates/universe i386 Packages [721 kB]
Get:37 http://mirrors.aliyun.com/ubuntu xenial-updates/universe Translation-en [332 kB]
Get:38 http://mirrors.aliyun.com/ubuntu xenial-updates/multiverse amd64 Packages [16.8 kB]
Get:39 http://mirrors.aliyun.com/ubuntu xenial-updates/multiverse i386 Packages [15.9 kB]
Get:40 http://mirrors.aliyun.com/ubuntu xenial-updates/multiverse Translation-en [8,468 B]
Get:41 http://mirrors.aliyun.com/ubuntu xenial-backports/main amd64 Packages [7,280 B]
Get:42 http://mirrors.aliyun.com/ubuntu xenial-backports/main i386 Packages [7,288 B]
Get:43 http://mirrors.aliyun.com/ubuntu xenial-backports/main Translation-en [4,456 B]
Get:44 http://mirrors.aliyun.com/ubuntu xenial-backports/universe amd64 Packages [8,064 B]
Get:45 http://mirrors.aliyun.com/ubuntu xenial-backports/universe i386 Packages [7,744 B]
Get:46 http://mirrors.aliyun.com/ubuntu xenial-backports/universe Translation-en [4,328 B]
Fetched 30.7 MB in 54s (563 kB/s)
Reading package lists... Done
纯净卸载安装过的软件，和该软件相关连的所有东西都会卸载，比较好用。
比如说，我卸载nano: sudo apt-get autoremove nano