使用ubuntu時，apt-get是很方便的乙個工具，但預設使用的歐洲源，國內速度太慢。可以把更新源換成速度更快的映象，並使用apt-fast去多執行緒更新。
1、備份更新原始檔
$ sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2、開啟更新原始檔編輯
$ sudo gedit /etc/apt/sources.list
3、根據ubuntu版本，把全部內容替換為如下內容
版本11.04
deb natty main restricted universe multiverse
deb natty-backports main restricted universe multiverse
deb natty-proposed main restricted universe multiverse
deb natty-security main restricted universe multiverse
deb natty-updates main restricted universe multiverse
deb-src natty main restricted universe multiverse
deb-src natty-backports main restricted universe multiverse
deb-src natty-proposed main restricted universe multiverse
deb-src natty-security main restricted universe multiverse
deb-src natty-updates main restricted universe multiverse
版本11.10
deb oneiric main restricted universe multiverse
deb oneiric-backports main restricted universe multiverse
deb oneiric-proposed main restricted universe multiverse
deb oneiric-security main restricted universe multiverse
deb oneiric-updates main restricted universe multiverse
deb-src oneiric main restricted universe multiverse
deb-src oneiric-backports main restricted universe multiverse
deb-src oneiric-proposed main restricted universe multiverse
deb-src oneiric-security main restricted universe multiverse
deb-src oneiric-updates main restricted universe multiverse
版本12.04
deb precise main restricted universe multiverse
deb precise-backports main restricted universe multiverse
deb precise-proposed main restricted universe multiverse
deb precise-security main restricted universe multiverse
deb precise-updates main restricted universe multiverse
deb-src precise main restricted universe multiverse
deb-src precise-backports main restricted universe multiverse
deb-src precise-proposed main restricted universe multiverse
deb-src precise-security main restricted universe multiverse
deb-src precise-updates main restricted universe multiverse
4、更新系統
$ sudo apt-get update
$ sudo apt-get dist-upgrade
5、安裝apt-fast
$ sudo add-apt-repository ppa:tldm217/tahutek.net
$ sudo apt-get update
$ sudo apt-get install apt-fast
#num_connections = 4
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