Ubuntu18.04更换国内源

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本文详细介绍如何在Ubuntu系统中更换软件源为阿里云源，包括备份旧源、使用gedit编辑器修改源文件以及更新系统软件包的过程。

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先备份以前的源，再用gedit打开更换源

#cp /etc/apt/sources.list /etc/apt/old_sources.list

#gedit /etc/apt/sources.list

删除/etc/apt/sources.list里面内容，添加下面阿里源

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

更新：

sudo apt-get update
sudo apt-get upgrade