有关Ubuntu18.04的换源问题

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我是靠谱客的博主安静小甜瓜，最近开发中收集的这篇文章主要介绍有关Ubuntu18.04的换源问题，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

记录一下自己遇见的一些小问题：
昨天在Ubuntu上想要安装一下vim和htop以及pstree但是发现输入命令后，都会显示没有可用的软件包，上网一顿搜以后，网上说只要update一下就可以了，因为Ubuntu的默认源是国外的，所以更新的特别慢，花了三个小时，满心期待……最后更新包报了一大堆错。
大概就是报了一些这样的错：

W: 无法下载 http://archive.scrapy.org/ubuntu/dists/scrapy/InRelease
无法解析域名“archive.scrapy.org”（网络不可达）
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。

然后明白因为源是国外的，所以有些网站好像是要翻墙的，这不仅造成更新特别慢的问题，也造成更新不成功的问题。然后想去换源，我换的是阿里云的源，换源之后你会发现更新软件什么的真的快了很多，原本更新源就花了三个多小时，换完之后就花了四十多分钟就把源和软件包全部更新完了。下面是换源的操作：

1，先进入root模式：

sudo -s

2，输入你的密码
3，进入源的目录：

cd /etc/apt

4，在换源之前最好备份一下自己的源（避免遇到问题的时候弄不回去）备份的代码：

cp sources.list sources.list.bak

5，这时候可以输入一下命令去修改源：

sudo gedit sources.list

这时候会进入<sources.list>的页面把原来的源删去然后改成你要的源就可以了，更改后点击保存。
6，这个时候就可以更新源啦：

sudo apt update

7，顺便把软件也更新一下：

sudo apt upgrade

这时候安装vim以及其他的就不会出错啦！
安装vim：

sudo apt install vim

安装pstree：

sudo apt install saidar

安装htop：

sudo apt install htop

下面是上网搜集的一些常用的源：

阿里云源：

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-proposed main restricted universe multiverse
deb-src 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-backports main restricted universe multiverse

中科大源：

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

清华大学源：

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

163源：

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