• Step 1.升级前准备

 1.Back Up Your System

 2.确定已正确联网

• Step 2.配置升级源

 将软件源完全指向 16.04(xenial)：
 将 /etc/apt/sources.list.d/中的全部文件重命名，文件名末尾加上 .backup
 将 /etc/apt/sources.list 内容全部清空 更换为以下内容
 
 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
 deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse
 deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
 deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
 deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse
 deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse

• Step 3.执行命令

    sudo apt-get update(升级系统软件包)
    sudo apt-get upgrade
    sudo apt-get dist-upgrade
    
    sudo apt-get clean(清理已经没有用的deb软件包)
    sudo do-release-upgrade(检测新版Ubuntu)
    
    lsb_release -a(重启后查看Ubuntu版本)    

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