sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
然后打开源列表，清空内容，将下面源列表粘贴到里面，保存。
sudo gedit /etc/apt/sources.list
更新源
sudo apt-get update
ubuntu 14.04 LTS 阿里云更新源、官方源和第三方更新源列表：
#aliyundeb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiversedeb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiversedeb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse #ubuntu deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiversedeb http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiversedeb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiversedeb http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiversedeb http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiversedeb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiversedeb-src http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiversedeb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiversedeb-src http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiversedeb-src http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse #ubuntu otherdeb http://archive.canonical.com/ubuntu/ trusty partnerdeb http://extras.ubuntu.com/ubuntu/ trusty main
作者：devzhaoyou
链接：https://www.jianshu.com/p/7b1adaf7a38b