ubuntu20.04下载地址： 中科大源 http://mirrors.ustc.edu.cn/ubuntu-releases/20.04/ 阿里云开源镜像站 http://mirrors.aliyun.com/ubuntu-releases/20.04/ 兰州大学开源镜像站 http://mirror.lzu.edu.cn/ubuntu-releases/20.04/ 北京理工大学开源http://mirror.bit.edu.cn/ubuntu-releases/20.04/ 浙江大学 http://mirrors.zju.edu.cn/ubuntu-releases/20.04/

打开Ubuntu的终端输入：

maliao@ubuntu:~$ sudo gedit /etc/apt/sources.list [sudo] maliao 的密码： 输入密码回车即可

将镜像地址更改为以下任意一个地址（下面提供了阿里，网易，清华，中科大镜像源地址），保存即可。

更换好源之后执行下方命令更新：

sudo apt-get update sudo apt-get upgrade

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##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————————————————版权声明：本文为CSDN博主「0x8g1T9E」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。原文链接：https://blog.csdn.net/sirobot/article/details/106309305