在Ubuntu上安装SSH

1.检查ssh是否安装

sudo service sshd status

1.如果出现Loaded: error (Reason: No such file or directory) ，则没有安装
2.如果安装并且运行了，会出现以下情况。Active: active (running)，表示 SSH 服务器正在运行。

ssh.service - OpenBSD Secure Shell server
Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enab
Active: active (running) since Fri 2025-08-29 19:46:41 PDT; 5min ago
Main PID: 902 (sshd)
Tasks: 1 (limit: 2295)
CGroup: /system.slice/ssh.service
└─902 /usr/sbin/sshd -D
Aug 29 19:46:42 ubuntu systemd[1]: Reloading OpenBSD Secure Shell server.
Aug 29 19:46:42 ubuntu sshd[902]: Received SIGHUP; restarting.
Aug 29 19:46:42 ubuntu sshd[902]: Server listening on 0.0.0.0 port 22.
Aug 29 19:46:42 ubuntu sshd[902]: Server listening on :: port 22.
Aug 29 19:46:42 ubuntu systemd[1]: Reloaded OpenBSD Secure Shell server.
Aug 29 19:46:42 ubuntu systemd[1]: Reloading OpenBSD Secure Shell server.
Aug 29 19:46:42 ubuntu sshd[902]: Received SIGHUP; restarting.
Aug 29 19:46:42 ubuntu sshd[902]: Server listening on 0.0.0.0 port 22.
Aug 29 19:46:42 ubuntu sshd[902]: Server listening on :: port 22.
Aug 29 19:46:42 ubuntu systemd[1]: Reloaded OpenBSD Secure Shell server.

2.安装ssh服务

1.更新软件包列表

sudo apt update

2.安装OpenSSH服务器

sudo apt install openssh-server

3.开启ssh服务

sudo service sshd start