ubuntu14.04LTS更新软件源

1. 备份原始源文件

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

2. 修改源文件

sudo gedit /etc/apt/source.list

ctrl+A delete原始文件内容

搜索网站https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/

选择对应的ubuntu release版本，这里我用的是14.04LTS，生成的源文件如下：

# 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

将以上内容粘贴在source.list文件中，保存，退出。

3. 重新回到命令行，sudo apt-get update

如果遇到无法获得锁

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执行 sudo rm /var/lib/apt/lists/lock