1、首先查看 dns 配置

• sudo vi /etc/resolv.conf

nameserver 114.114.114.114

nameserver 8.8.8.8

2、修改 apt-get 源

• sudo vi /etc/apt/sources.list

## 清华的源

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty main restricted universe multiverse

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-security main restricted universe multiverse

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-updates main restricted universe multiverse

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-backports main restricted universe multiverse

##测试版源

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-proposed main restricted universe multiverse

# 源码

deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty main restricted universe multiverse

deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-security main restricted universe multiverse

deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-updates main restricted universe multiverse

deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-backports main restricted universe multiverse

##测试版源

deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ trusty-proposed main restricted universe multiverse

# Canonical 合作伙伴和附加

deb http://archive.canonical.com/ubuntu/ trusty partner

deb http://extras.ubuntu.com/ubuntu/ trusty main

• sudo apt-get update

参考

• Ubuntu 更新错误修复大全