为什么速度这么快？
apt-fast is a shellscript wrapper for apt-get and aptitude that can drastically improve apt download times by downloading packages in parallel, with multiple connections per package.
Setup/Install
PPA
You can use the PPA to get a graphical configuration file setup and automatic updates, for details see: ppa:apt-fast/stable.
Some distros, such as PCLinuxOS include apt-fast in their repos.
Manual
For those of you who want to manually install it, download it and perform the following:
cp apt-fast /usr/bin/
chmod +x /usr/bin/apt-fast
cp apt-fast.conf /etc
You need to have aria2c installed（先安装这个）:
apt-get install aria2
Then, you should be ready to use it - simply run apt-fast instead of apt-get or aptitude any time you find yourself needing to manage packages!
官方项目主页：
https://github.com/ilikenwf/apt-fast
