一
编辑源列表文件
$ vim /etc/apt/sources.list
二
查看新版本信息
$ lsb_release -c
ubuntu版本的系统代号
Ubuntu 12.04 (LTS)代号为precise
Ubuntu 14.04 (LTS)代号为trusty
Ubuntu 15.04 代号为vivid
Ubuntu 15.10 代号为wily
Ubuntu 16.04 (LTS)代号为xenial
三
将原有的内容注释掉，添加以下内容（或者你把里面内容修改成下面的就可以，但是不能有除了以下内容的有效内容）
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
ps.知道我为什么说版本号吗？只要把我的版本号bionic改成你的版本号就能用了
四
#更新软件列表 $ sudo apt-get update #更新软件包 $ sudo apt-get upgrade