Ubuntu12.04 Add a domestic software source (163, Sohu, USTC), edit the Sources.list file
sudo nano/etc/apt/sources.list
Add the following content, save and then sudo apt-get update.
In the case of other Ubuntu versions, simply change the precise to the corresponding version name. Hardy (8.04), Lucid (10.04), Maverick (10.10), oneiric (11.10), Quantal (12.10), Precise (12.04)
#163
Deb Http://mirrors.163.com/ubuntu/precise main restricted universe multiverse
Deb Http://mirrors.163.com/ubuntu/precise-security main restricted universe multiverse
Deb Http://mirrors.163.com/ubuntu/precise-updates main restricted universe multiverse
Deb http://mirrors.163.com/ubuntu/precise-proposed main restricted universe multiverse
Deb Http://mirrors.163.com/ubuntu/precise-backports main restricted universe multiverse
DEB-SRC http://mirrors.163.com/ubuntu/precise main restricted universe multiverse
DEB-SRC http://mirrors.163.com/ubuntu/precise-security main restricted universe multiverse
DEB-SRC http://mirrors.163.com/ubuntu/precise-updates main restricted universe multiverse
DEB-SRC http://mirrors.163.com/ubuntu/precise-proposed main restricted universe multiverse
DEB-SRC http://mirrors.163.com/ubuntu/precise-backports main restricted universe multiverse
#sohu
Deb Http://mirrors.sohu.com/ubuntu/precise main restricted universe multiverse
Deb Http://mirrors.sohu.com/ubuntu/precise-security main restricted universe multiverse
Deb Http://mirrors.sohu.com/ubuntu/precise-updates main restricted universe multiverse
Deb http://mirrors.sohu.com/ubuntu/precise-proposed main restricted universe multiverse
Deb Http://mirrors.sohu.com/ubuntu/precise-backports main restricted universe multiverse
DEB-SRC http://mirrors.sohu.com/ubuntu/precise main restricted universe multiverse
DEB-SRC http://mirrors.sohu.com/ubuntu/precisec-security main restricted universe multiverse
DEB-SRC http://mirrors.sohu.com/ubuntu/precise-updates main restricted universe multiverse
DEB-SRC http://mirrors.sohu.com/ubuntu/precise-proposed main restricted universe multiverse
DEB-SRC http://mirrors.sohu.com/ubuntu/precise-backports main restricted universe multiverse
#ustc
Deb Http://mirrors.ustc.edu.cn/ubuntu/precise main restricted universe multiverse
Deb Http://mirrors.ustc.edu.cn/ubuntu/precise-security main restricted universe multiverse
Deb Http://mirrors.ustc.edu.cn/ubuntu/precise-updates main restricted universe multiverse
Deb http://mirrors.ustc.edu.cn/ubuntu/precise-proposed main restricted universe multiverse
Deb Http://mirrors.ustc.edu.cn/ubuntu/precise-backports main restricted universe multiverse
DEB-SRC http://mirrors.ustc.edu.cn/ubuntu/precise main restricted universe multiverse
DEB-SRC http://mirrors.ustc.edu.cn/ubuntu/precise-security main restricted universe multiverse
DEB-SRC http://mirrors.ustc.edu.cn/ubuntu/precise-updates main restricted universe multiverse
DEB-SRC http://mirrors.ustc.edu.cn/ubuntu/precise-proposed main restricted universe multiverse
DEB-SRC http://mirrors.ustc.edu.cn/ubuntu/precise-backports main restricted universe multiverse
Ubuntu Domestic Source