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Ubuntu18.04 关闭和开启图形界面

  1. 关闭用户图形界面

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    sudo systemctl set-default multi-user.target
    sudo reboot

  2. 开启用户图形界面

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    sudo systemctl set-default graphical.target
    sudo reboot

openssh

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apt-get install openssh-server

修改配置文件: /etc/ssh/sshd_config

找到

# Authentication:  
LoginGraceTime 120  
PermitRootLogin prohibit-password  
StrictModes yes
更改为

# Authentication:  
LoginGraceTime 120  
#PermitRootLogin prohibit-password  
PermitRootLogin yes  
StrictModes yes
重启ssh服务

sudo service ssh restart

关闭防火墙

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ufw disable

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开机自动启动ssh命令
sudo systemctl enable ssh
 
关闭ssh开机自动启动命令
sudo systemctl disable ssh
 
单次开启ssh
sudo systemctl start ssh
 
单次关闭ssh
sudo systemctl stop ssh
 
设置好后重启系统
reboot
 
#查看ssh是否启动，看到Active: active (running)即表示成功
sudo systemctl status ssh