1，首先备份原来的源 sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
2，编辑软件源的文件 sudo vim /etc/apt/sources.list把下列源添加到后面
3，刷新源：sudo apt-get update
更新：sudo update-manager -c -d
#闭源
deb http://archive.canonical.com/ubuntu/ vivid partner
deb http://extras.ubuntu.com/ubuntu/ vivid main
#搜狐源
deb http://mirrors.sohu.com/ubuntu/ vivid main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ vivid-security main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ vivid-updates main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ vivid-proposed main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ vivid-backports main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ vivid main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ vivid-security main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ vivid-updates main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ vivid-proposed main restricted universe multiverse
deb-src http://mirrors.sohu.com/ubuntu/ vivid-backports main restricted universe multiverse
#阿里云源
deb http://mirrors.aliyun.com/ubuntu/ vivid main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-backports main restricted universe multiverse
#网易源
deb http://mirrors.aliyun.com/ubuntu/ vivid main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-backports main restricted universe multiverse
Ubuntu 15.10更新源已可用，更新到Ubuntu 15.10的方法：http://www.linuxdiyf.com/linux/11955.html
Ubuntu 15.04更新源：http://www.linuxdiyf.com/linux/11839.html
在Ubuntu 15.04中配置软件源、软件更新、语言支持：http://www.linuxdiyf.com/linux/11644.html