推荐使用清华镜像：https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/

 

将下列文本添加到/etc/apt/sources.list文件里

 

 

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释

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

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

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

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

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

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

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

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

 

# 预发布软件源，不建议启用

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

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

 

或者进入repogen.simplylinux.ch 选择合适的Ubuntu版本后，在ubuntu Branches下全选

 

拉至网页最下，点击生产，复制list下内容，添加到/etc/apt/sources.list中即可

 

具体参考https://jingyan.baidu.com/article/afd8f4de66efcf34e286e993.html?st=2&os=0&bd_page_type=1&net_type=2

 

修改镜像源之后需要重新更新：

 

sudo apt-get update；sudo apt-get upgrade

如果执行sudo apt-get update仍然报错，问题在于DNS没有配置好。 

解决方法：

 

sudo vi /etc/resolv.conf

在其中添加：

 

 

 # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

 # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

 nameserver 127.0.1.1

 #这里用的是阿里云的DNS服务器

 nameserver 223.5.5.5  

 nameserver 223.6.6.6

 

 

 

百闻不如一见，百见不如一做，只有做了，才知道问题出现在哪儿，才能去解决问题。