Linux换源

前言

安装完Linux系统，尽量更换源以提高安装软件的速度。

步骤

1. 备份原始源列表sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2. 修改sources.list
sudo vim /etc/apt/sources.list
3. 将内容替换成对应的源
   

**PS：清华源地址：https://mirror.tuna.tsinghua.edu.cn/help/ubuntu/ **
（根据系统赋值对应的源）
4.更新并升级
sudo apt-get update && sudo apt-get upgrade

Q&A

问题1

遇到sudp apt-get update错误
liuxinyu20@ubuntu:~$ sudo apt-get update Hit:2 https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal InRelease Hit:3 https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-updates InRelease Hit:4 https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-backports InRelease Hit:1 https://packages.microsoft.com/repos/code stable InRelease Hit:5 http://security.ubuntu.com/ubuntu focal-security InRelease Err:6 https://download.docker.com/linux/ubuntu focal InRelease Cannot initiate the connection to download.docker.com:443 (2a03:2880:f12c:183:face:b00c:0:25de). - connect (101: Network is unreachable) Could not connect to download.docker.com:443 (162.220.12.226). - connect (111: Connection refused) Reading package lists... Done W: Failed to fetch https://download.docker.com/linux/ubuntu/dists/focal/InRelease Cannot initiate the connection to download.docker.com:443 (2a03:2880:f12c:183:face:b00c:0:25de). - connect (101: Network is unreachable) Could not connect to download.docker.com:443 (162.220.12.226). - connect (111: Connection refused) W: Some index files failed to download. They have been ignored, or old ones used instead.

解决方法：

1.进入/etc/apt/sources.list.d/ 目录 ，删除 docker.list 和 docker.list.save文件

cd /etc/apt/sources.list.d/
sudo rm -f docker.list
sudo rm -f docker.list.save

2.依次找到 Software & Updates -> Other SoftWare 找到会发现报错的网址就在此处并取消勾选