Ubuntu18 更换 apt 源为阿里云

Step1. 备份 list 文件

进入对应文件夹，用管理员权限，执行复制操作：

cd /etc/apt/
sudo cp sources.list sources.list.bak

Step2. 修改 list 文件

通过管理员权限，使用 vim 进行修改：

sudo vim sources.list

将下列代码替换 sources.list文件内容

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

Step3. 更新软件列表

使用管理员权限，执行命令：

sudo apt-get update
sudo apt-get upgrade

 注意：要更新源的前提是ubuntu能够联网。

如果出现以下情况就说明没有联网忙，所以要先解决无法联网的问题，再进行换源

错误:1 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic InRelease
  无法解析域名“mirrors.tuna.tsinghua.edu.cn”
错误:2 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-updates InRelease
  无法解析域名“mirrors.tuna.tsinghua.edu.cn”
错误:3 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-backports InRelease
  无法解析域名“mirrors.tuna.tsinghua.edu.cn”
错误:4 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-security InRelease
  无法解析域名“mirrors.tuna.tsinghua.edu.cn”
错误:5 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-proposed InRelease
  无法解析域名“mirrors.tuna.tsinghua.edu.cn”
正在读取软件包列表... 完成
正在分析软件包的依赖关系树       
正在读取状态信息... 完成       
所有软件包均为最新。
W: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/bionic/InRelease  无法解析域名“mirrors.tuna.tsinghua.edu.cn”
W: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/bionic-updates/InRelease  无法解析域名“mirrors.tuna.tsinghua.edu.cn”
W: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/bionic-backports/InRelease  无法解析域名“mirrors.tuna.tsinghua.edu.cn”
W: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/bionic-security/InRelease  无法解析域名“mirrors.tuna.tsinghua.edu.cn”
W: 无法下载 https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/bionic-proposed/InRelease  无法解析域名“mirrors.tuna.tsinghua.edu.cn”
W: 部分索引文件下载失败。如果忽略它们，那将转而使用旧的索引文件。

在主机为无线上网，虚拟机设定的时候最好用“桥接模式”方法如下：

1. 关闭正在运行的虚拟机ubuntu，将其联网方式设定为“桥接模式”。

 

 2. 启动ubuntu虚拟机即可

附：国内常见源

阿里云：

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

中科大：

deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse

网易：

deb http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse

清华：

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse