给ubuntu选择最快的更新源
1、打开设置》》软件和更新,如下图

2、下载自:下拉菜单,选择其他站点

3、你可以选择最佳服务器,也可以指定你满意的服务器。选择之后要求输入密码

4、选择关闭,之后会重新自动执行更新命令(sudo apt-get update),更新完成

安装Ubuntu18.04后,使用国外源太慢了,修改为国内源会快很多。
修改阿里源为Ubuntu 18.04默认的源
备份/etc/apt/sources.list#备份cp /etc/apt/sources.list /etc/apt/sources.list.bak
在/etc/apt/sources.list文件前面添加如下条目
#添加阿里源deb http://mirrors.ali***yun.com/ubuntu/ bionic main restricted universe multiversedeb http://mirrors.ali***yun.com/ubuntu/ bionic-security main restricted universe multiversedeb http://mirrors.ali***yun.com/ubuntu/ bionic-updates main restricted universe multiversedeb http://mirrors.ali***yun.com/ubuntu/ bionic-proposed main restricted universe multiversedeb http://mirrors.ali***yun.com/ubuntu/ bionic-backports main restricted universe multiversedeb-src http://mirrors.ali***yun.com/ubuntu/ bionic main restricted universe multiversedeb-src http://mirrors.ali***yun.com/ubuntu/ bionic-security main restricted universe multiversedeb-src http://mirrors.ali***yun.com/ubuntu/ bionic-updates main restricted universe multiversedeb-src http://mirrors.ali***yun.com/ubuntu/ bionic-proposed main restricted universe multiversedeb-src http://mirrors.ali***yun.com/ubuntu/ bionic-backports main restricted universe multiverse
最后执行如下命令更新源
##更新sudo apt-get updatesudo apt-get upgrade
另外其他几个国内源如下:中科大源
##中科大源deb https://mirrors.ust*c.ed**u.cn/ubuntu/ bionic main restricted universe multiversedeb-src https://mirrors.ust*c.ed**u.cn/ubuntu/ bionic main restricted universe multiversedeb https://mirrors.ust*c.ed**u.cn/ubuntu/ bionic-updates main restricted universe multiversedeb-src https://mirrors.ust*c.ed**u.cn/ubuntu/ bionic-updates main restricted universe multiversedeb https://mirrors.ust*c.ed**u.cn/ubuntu/ bionic-backports main restricted universe multiversedeb-src https://mirrors.ust*c.ed**u.cn/ubuntu/ bionic-backports main restricted universe multiversedeb https://mirrors.ust*c.ed**u.cn/ubuntu/ bionic-security main restricted universe multiversedeb-src https://mirrors.ust*c.ed**u.cn/ubuntu/ bionic-security main restricted universe multiversedeb https://mirrors.ust*c.ed**u.cn/ubuntu/ bionic-proposed main restricted universe multiversedeb-src https://mirrors.ust*c.ed**u.cn/ubuntu/ bionic-proposed main restricted universe multiverse
163源
##163源deb http://mirrors.1***63.com/ubuntu/ bionic main restricted universe multiversedeb http://mirrors.1***63.com/ubuntu/ bionic-security main restricted universe multiversedeb http://mirrors.1***63.com/ubuntu/ bionic-updates main restricted universe multiversedeb http://mirrors.1***63.com/ubuntu/ bionic-proposed main restricted universe multiversedeb http://mirrors.1***63.com/ubuntu/ bionic-backports main restricted universe multiversedeb-src http://mirrors.1***63.com/ubuntu/ bionic main restricted universe multiversedeb-src http://mirrors.1***63.com/ubuntu/ bionic-security main restricted universe multiversedeb-src http://mirrors.1***63.com/ubuntu/ bionic-updates main restricted universe multiversedeb-src http://mirrors.1***63.com/ubuntu/ bionic-proposed main restricted universe multiversedeb-src http://mirrors.1***63.com/ubuntu/ bionic-backports main restricted universe multiverse
清华源
##清华源deb https://mirrors.**tun*a.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiversedeb-src https://mirrors.**tun*a.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiversedeb https://mirrors.**tun*a.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiversedeb-src https://mirrors.**tun*a.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiversedeb https://mirrors.**tun*a.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiversedeb-src https://mirrors.**tun*a.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiversedeb https://mirrors.**tun*a.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiversedeb-src https://mirrors.**tun*a.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiversedeb https://mirrors.**tun*a.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiversedeb-src https://mirrors.**tun*a.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
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