sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
 sudo gedit /etc/apt/sources.list
sudo apt-get update
Ubuntu 官方更新服务器（欧洲，此为官方源，国内较慢，但无同步延迟问题，电信、移动/铁通、联通等公网用户可以使用)：
deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse Ubuntu官方提供的其他软件（第三方闭源软件等）：
deb http://archive.canonical.com/ubuntu/ trusty partner deb http://extras.ubuntu.com/ubuntu/ trusty main
骨头兄亲自搭建并维护的 Ubuntu 源（该源位于浙江杭州百兆共享宽带的电信机房)，包含 Deepin 等镜像：
deb http://ubuntu.srt.cn/ubuntu/ trusty main restricted universe multiverse deb http://ubuntu.srt.cn/ubuntu/ trusty-security main restricted universe multiverse deb http://ubuntu.srt.cn/ubuntu/ trusty-updates main restricted universe multiverse deb http://ubuntu.srt.cn/ubuntu/ trusty-proposed main restricted universe multiverse deb http://ubuntu.srt.cn/ubuntu/ trusty-backports main restricted universe multiverse deb-src http://ubuntu.srt.cn/ubuntu/ trusty main restricted universe multiverse deb-src http://ubuntu.srt.cn/ubuntu/ trusty-security main restricted universe multiverse deb-src http://ubuntu.srt.cn/ubuntu/ trusty-updates main restricted universe multiverse deb-src http://ubuntu.srt.cn/ubuntu/ trusty-proposed main restricted universe multiverse deb-src http://ubuntu.srt.cn/ubuntu/ trusty-backports main restricted universe multiverse
网易163更新服务器（广东广州电信/联通千兆双线接入），包含其他开源镜像：
deb http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse
搜狐更新服务器（山东联通千兆接入，官方中国大陆地区镜像跳转至此） ，包含其他开源镜像：
deb http://mirrors.sohu.com/ubuntu/ trusty main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ trusty-security main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ trusty-updates main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ trusty-proposed main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ trusty-backports main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ trusty main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ trusty-security main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ trusty-updates main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ trusty-proposed main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ trusty-backports main restricted universe multiverse
LupaWorld 更新服务器（浙江杭州电信/联通双线服务器），包含其他开源镜像：
deb http://mirror.lupaworld.com/ubuntu trusty main restricted universe multiverse deb http://mirror.lupaworld.com/ubuntu trusty-security main restricted universe multiverse deb http://mirror.lupaworld.com/ubuntu trusty-updates main restricted universe multiverse deb http://mirror.lupaworld.com/ubuntu trusty-backports main restricted universe multiverse deb http://mirror.lupaworld.com/ubuntu trusty-proposed main restricted universe multiverse deb-src http://mirror.lupaworld.com/ubuntu trusty main restricted universe multiverse deb-src http://mirror.lupaworld.com/ubuntu trusty-security main restricted universe multiverse deb-src http://mirror.lupaworld.com/ubuntu trusty-updates main restricted universe multiverse deb-src http://mirror.lupaworld.com/ubuntu trusty-backports main restricted universe multiverse deb-src http://mirror.lupaworld.com/ubuntu trusty-proposed main restricted universe multiverse
常州贝特康姆软件技术有限公司 更新服务器（江苏常州电信服务器），包含其他开源镜像。
( CN99域名 系 “常州市亚科技术有限公司” 所注册，但此公司与常州贝特康姆的法人代表和营业地址相同。所以本镜像实际即原 CN99。但现在 CN99镜像的域名已改为跳转至网易镜像）:
deb http://centos.bitcomm.cn/ubuntu trusty main restricted universe multiverse deb http://centos.bitcomm.cn/ubuntu trusty-security main restricted universe multiverse deb http://centos.bitcomm.cn/ubuntu trusty-updates main restricted universe multiverse deb http://centos.bitcomm.cn/ubuntu trusty-backports main restricted universe multiverse deb http://centos.bitcomm.cn/ubuntu trusty-proposed main restricted universe multiverse deb-src http://centos.bitcomm.cn/ubuntu trusty main restricted universe multiverse deb-src http://centos.bitcomm.cn/ubuntu trusty-security main restricted universe multiverse deb-src http://centos.bitcomm.cn/ubuntu trusty-updates main restricted universe multiverse deb-src http://centos.bitcomm.cn/ubuntu trusty-backports main restricted universe multiverse
deb-src http://centos.bitcomm.cn/ubuntu trusty-proposed main restricted universe multiverse (责任编辑：IT) |
