1、获取root权限
sudo passwd root su root
2、把所有包升级至 14.04 的最新版
aptitude update aptitude full-upgrade -y
3、更改更新源为16.04
vim /etc/apt/sources.list # 清空文件后粘贴如以下代码： deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse # :wq 保存退出
4、升级至 16.04
aptitude update aptitude safe-upgrade -y #注1：升级过程中会提示你重启服务（restart services），选yes #注2：还会出现文件冲突，保留当前版本（current version）即可，输入N
5、把所有包升级至 16.04 (xenial) 的最新版，并重装丢失的aptitude包，最后清理无用包
apt-get dist-upgrade apt-get install aptitude apt-get autoremove