1 首先备份源列表:
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
2 而后用gedit或其他编辑器打开:
sudo gedit /etc/apt/sources.list
3 更新源：
deb http://mirrors.sohu.com/ubuntu/ oneiric main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ oneiric-security main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ oneiric-updates main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ oneiric-proposed main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ oneiric-backports main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ oneiric main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ oneiric-security main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ oneiric-updates main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ oneiric-proposed main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ oneiric-backports main restricted universe multiverse
4 刷新列表：
sudo apt-get update
