更新源 安装好系统后,先更新源,方便后面能比较快地下载各种软件包. 备份/etc/apt/sources.list,然后将内容全部替代为: # deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer…