选择安装“增强功能”，系统光驱会自动挂载镜像。若没有则到对应目录下运行sudo ./VBoxLinuxAdditions.run
为了主机与虚拟机互通，虚拟机设置->网络->网卡1里选择"桥接网卡"，混杂模式选“全部允许”。
虚拟机设置->共享文件夹->添加共享文件夹，设置好文件夹名称（后面要用到）。选择“自动挂载”，“自动分配”。
虚拟机设置->常规->高级->共享粘贴板->双向。 虚拟机设置->存储->控制器->使用主机输入输出。 虚拟机设置->存储->控制器->vdi->固态驱动器。 没有生效重启看看。
右ctrl + home唤出界面菜单栏。
版本：ubuntu-20.04-desktop-amd64.iso ubuntu开发环境配置
ubuntu20的ip设置与之前的版本不一样。现在使用/etc/netplan/xxx.yaml来配置固定ip。 在这之前，先查看网卡信息，ifconfig，得知网卡名称为enp0s3 编辑配置文件，我的是01-network-manager-all.yaml，ip改为10.0.0.111。 执行命令 sudo netplan try sudo netplan apply
修改/etc/apt/sources.list，修改前请记得备份。（命令：复制cp，移动mv）
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