1 备份初始源配置
sudo cp /etc/apt/sources.list /etc/apt/sources.list_bak2 删除并替换/etc/apt/sources.list内容
sudo vim /etc/apt/sources.list这里更改为阿里云源
Ubuntu 18.04下源参考
阿里云源：
deb ubuntu安装包下载_开源镜像站-阿里云 bionic main restricted universe multiverse
deb ubuntu安装包下载_开源镜像站-阿里云 bionic-security main restricted universe multiverse
deb ubuntu安装包下载_开源镜像站-阿里云 bionic-updates main restricted universe multiverse
deb ubuntu安装包下载_开源镜像站-阿里云 bionic-proposed main restricted universe multiverse
deb ubuntu安装包下载_开源镜像站-阿里云 bionic-backports main restricted universe multiverse
deb-src ubuntu安装包下载_开源镜像站-阿里云 bionic main restricted universe multiverse
deb-src ubuntu安装包下载_开源镜像站-阿里云 bionic-security main restricted universe multiverse
deb-src ubuntu安装包下载_开源镜像站-阿里云 bionic-updates main restricted universe multiverse
deb-src ubuntu安装包下载_开源镜像站-阿里云 bionic-proposed main restricted universe multiverse
deb-src ubuntu安装包下载_开源镜像站-阿里云 bionic-backports main restricted universe multiverse
网易源：
deb Index of /ubuntu/ bionic main restricted universe multiverse
deb Index of /ubuntu/ bionic-security main restricted universe multiverse
deb Index of /ubuntu/ bionic-updates main restricted universe multiverse
deb Index of /ubuntu/ bionic-proposed main restricted universe multiverse
deb Index of /ubuntu/ bionic-backports main restricted universe multiverse
deb-src Index of /ubuntu/ bionic main restricted universe multiverse
deb-src Index of /ubuntu/ bionic-security main restricted universe multiverse
deb-src Index of /ubuntu/ bionic-updates main restricted universe multiverse
deb-src Index of /ubuntu/ bionic-proposed main restricted universe multiverse
deb-src Index of /ubuntu/ bionic-backports main restricted universe multiverse
清华源：
deb Index of /ubuntu/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror bionic main restricted universe multiverse
deb-src Index of /ubuntu/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror bionic main restricted universe multiverse
deb Index of /ubuntu/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror bionic-updates main restricted universe multiverse
deb-src Index of /ubuntu/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror bionic-updates main restricted universe multiverse
deb Index of /ubuntu/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror bionic-backports main restricted universe multiverse
deb-src Index of /ubuntu/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror bionic-backports main restricted universe multiverse
deb Index of /ubuntu/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror bionic-security main restricted universe multiverse
deb-src Index of /ubuntu/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror bionic-security main restricted universe multiverse
deb Index of /ubuntu/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror bionic-proposed main restricted universe multiverse
deb-src Index of /ubuntu/ | 清华大学开源软件镜像站 | Tsinghua Open Source Mirror bionic-proposed main restricted universe multiverse
中科大源：
deb Index of /ubuntu/ bionic main restricted universe multiverse
deb-src Index of /ubuntu/ bionic main restricted universe multiverse
deb Index of /ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb Index of /ubuntu/ bionic-backports main restricted universe multiverse
deb-src Index of /ubuntu/ bionic-backports main restricted universe multiverse
deb Index of /ubuntu/ bionic-security main restricted universe multiverse
deb-src Index of /ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src Index of /ubuntu/ bionic-proposed main restricted universe multiverse
3 更新
sudo apt-get update
