Windows10 Linux子系统（Ubuntu)软件源默认是国外的，国内访问速度较慢，可以将其替换为国内地址提升软件下载和更新速度。
替换方法
使用vi编辑器编辑/etc/apt/sources.list文件，操作前备份一个，以防出现异常能够还原。可能需要root权限，因此加上sudo
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo vi /etc/apt/sources.list
在文件的最前面粘贴国内源，国内源有很多，随便选一个就行
保存后执行下面两行代码更新一下
sudo apt-get update sudo apt-get upgrade
阿里云源
deb https://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb https://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb https://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb https://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb https://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
网易源
deb https://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse deb https://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse deb https://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse deb https://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse deb https://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src https://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse deb-src https://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse deb-src https://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src https://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse deb-src https://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
清华源
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
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