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ubuntu20.04下载地址：
中科大源
http://mirrors.ustc.edu/ubuntu-releases/20.04/
阿里云开源镜像站
http://mirrors.aliyun/ubuntu-releases/20.04/
兰州大学开源镜像站
http://mirror.lzu.edu/ubuntu-releases/20.04/
北京理工大学开源
http://mirror.bit.edu/ubuntu-releases/20.04/
浙江大学
http://mirrors.zju.edu/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
#阿里源
deb http://mirrors.aliyun/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-backports main restricted universe multiverse
#网易源
deb http://mirrors.163/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.163/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.163/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.163/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.163/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.163/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.163/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.163/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.163/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.163/ubuntu/ bionic-backports main restricted universe multiverse
#清华源
deb https://mirrors.tuna.tsinghua.edu/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu/ubuntu/ bionic-proposed main restricted universe multiverse
##中科大源
deb https://mirrors.ustc.edu/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.ustc.edu/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.ustc.edu/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.ustc.edu/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.ustc.edu/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.ustc.edu/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.ustc.edu/ubuntu/ bionic-proposed main restricted universe multiverse
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