安装ubuntu18后默认是没有ssh，以下是初始化的一些步骤

1.设置vi

解决vi的方向键变ABCD的问题(做系统的傻鸟键盘不是地球键盘吧，还是他从不用vi)

参考：https://blog.csdn.net/weixin_44448313/article/details/110083669

sudo vi /etc/vim/vimrc.tiny

将set compatible修改为set nocompatible

2.设置源

将源设置为阿里镜像，不然你啥软件都不能在线安装

sudo vi /etc/apt/sources.list

注释原有源，并添加以下源

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

更新软件列表

sudo apt-get update

3.安装ssh

#安装ssh
sudo apt install openssh-server
#启动服务
sudo service ssh start
#修改配置，支持root远程登录，如没有该文件，需重启下ssh服务
sudo vi /etc/ssh/sshd_config
#将PermitRootLogin prohibit-password改成PermitRootLogin yes
# 重启服务
sudo systemctl restart sshd

4.查询虚拟机ip

ifconfig
#如果没有ifconfig，以下命令进行安装
sudo apt-get install net-tools

以上步骤完成后就可以通过ssh连上虚拟机的ubuntu了