Ubuntu 14.10 sudo apt-get update 出错的一种可能解决方法

先做备份sudo cp /etc/apt/sources.list  /etc/apt/sources.list.bak; sudo rm /var/lib/apt/lists/*
接着执行sudo gedit   /etc/apt/sources.list，打开该文件，将其中的内容全部替换为：

deb http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ trusty main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse保存后先后执行sudo apt-get update, sudo apt-get upgrade即可。