. 给ubuntu 换源,ubuntu 的默认的资源地址是国外的服务器，更新升级都会很卡，所以先换源。
cd /etc/apt # 切换到 apt目录下sudo mv sources.list sources.list.bak # 将当前的源备份sudo vi sources.list #写一个新的文件输入以下内容 按 i 开始输入 保存退出时 wq
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
这样就可以使用国内的阿里云的镜像了
sudo apt update # 更新软件列表sudo apt upgrade #将本地已经安装的软件跟列表对比 更新