更换Ubuntu软件源

由于Ubuntu官方软件源太慢了，换回国内的软件源这样快很多。

1. 备份源配置文件

代码语言：javascript复制

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

2. 修改配置文件

代码语言：javascript复制

sudo gedit /etc/apt/sources.list 

覆盖sources.list配置文件的内容：

代码语言：javascript复制

# 清华大学软件源
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

3. 更新软件源

代码语言：javascript复制

sudo apt-get update

ubuntu list 备份 软件

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