Unit sshd. service could not be found

Linux see ssh Prompt when the service status is Unit sshd.service could not be found.

1、 see ssh、sshd Are all installed ：ps -e|grep ssh

2、 Not installed... Is shown here sshd, install ：sudo apt-get install openssh-server

notes ： If you execute sudo Command prompt “xxx  be not in sudoers In file . It will be reported .”, Please refer to perform sudo The command prompt user name is not in sudoers In file

3、 Check it again sshd state ：systemctl status sshd, At this time, no more errors are reported