安装Ubuntu服务器或桌面后，您有一个问题：默认在Ubuntu上启用了SSH？那么答案是绝对的不'。用户或管理员必须通过触发单行命令来安装或启用SSH，我们将在本文中显示。但是在此之前，让我们看看什么是SSH？
这固定外壳（SSH）是一项协议，它允许我们通过安全频道远程连接Ubuntu服务器或桌面。它允许运行所有命令，远程运行我们可以在服务器上实际运行的命令。甚至用户也可以运行命令行和图形程序，传输文件，甚至可以通过Internet创建安全的虚拟专用网络。它是由IETF网络工作组和更可靠的协议开发的，该协议为远程登录会话和其他网络服务提供了安全性。 SSH最初是UNIX系统上的程序，后来迅速扩展到其他操作平台。 SSH客户端可在Linux，Solaris，Windows，MacOS等多个平台上找到。
在这里，我们让您知道如何在Ubuntu（18.04，17.04，16.04，14.04…）或Linux Mint上启用SSH。
- 打开指挥末端l在Ubuntu服务器或桌面上。
- 要在图形模式下打开命令终端，用户可以使用快捷方式Ctrl+Alt+t
- 作为标准用户或根登录。对于root，一个人可以使用sudo -i
- 运行命令：sudo apt-get安装ssh
- 以上命令将安装三个软件包：OpenSSH-CLIENT，OPENSSH-SERVER和OPENSSH-SFTP-SERVER。
- 一旦安装了SSH服务器，使用此命令在Ubuntu上启用它：sudo服务SSH开始
- 现在，使用以下方式检查Ubuntu上的SSH服务器的状态：sudo服务SSH状态
如果要编辑SSH的某些设置，例如侦听端口，root登录权限以及可以通过此命令编辑配置文件来完成的更多信息：
sudo nano /etc/ssh/sshd_config
上述所有命令的输出：
h2s@DESKTOP-N53EEI1:~$ sudo apt-get install ssh [sudo] password for h2s: Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: libgsoap-2.8.60 libvncserver1 Use 'sudo apt autoremove' to remove them. The following additional packages will be installed: openssh-client openssh-server openssh-sftp-server Suggested packages: keychain libpam-ssh monkeysphere ssh-askpass molly-guard rssh The following NEW packages will be installed: ssh The following packages will be upgraded: openssh-client openssh-server openssh-sftp-server 3 upgraded, 1 newly installed, 0 to remove and 174 not upgraded. Need to get 997 kB of archives. After this operation, 106 kB of additional disk space will be used. Do you want to continue? [Y/n] Y Get:1 https://archive.ubuntu.com/ubuntu bionic-updates/main amd64 openssh-sftp-server amd64 1:7.6p1-4ubuntu0.3 [45.6 kB] Get:2 https://archive.ubuntu.com/ubuntu bionic-updates/main amd64 openssh-server amd64 1:7.6p1-4ubuntu0.3 [333 kB] Get:3 https://archive.ubuntu.com/ubuntu bionic-updates/main amd64 openssh-client amd64 1:7.6p1-4ubuntu0.3 [614 kB] Get:4 https://archive.ubuntu.com/ubuntu bionic-updates/main amd64 ssh all 1:7.6p1-4ubuntu0.3 [5204 B] Fetched 997 kB in 5s (197 kB/s) Preconfiguring packages ... (Reading database ... 99318 files and directories currently installed.) Preparing to unpack .../openssh-sftp-server_1%3a7.6p1-4ubuntu0.3_amd64.deb ... Unpacking openssh-sftp-server (1:7.6p1-4ubuntu0.3) over (1:7.6p1-4) ... Preparing to unpack .../openssh-server_1%3a7.6p1-4ubuntu0.3_amd64.deb ... Unpacking openssh-server (1:7.6p1-4ubuntu0.3) over (1:7.6p1-4) ... Preparing to unpack .../openssh-client_1%3a7.6p1-4ubuntu0.3_amd64.deb ... Unpacking openssh-client (1:7.6p1-4ubuntu0.3) over (1:7.6p1-4) ... Selecting previously unselected package ssh. Preparing to unpack .../ssh_1%3a7.6p1-4ubuntu0.3_all.deb ... Unpacking ssh (1:7.6p1-4ubuntu0.3) ... Processing triggers for ufw (0.35-5) ... Processing triggers for ureadahead (0.100.0-20) ... Processing triggers for systemd (237-3ubuntu10.3) ... Processing triggers for man-db (2.8.3-2) ... Setting up openssh-client (1:7.6p1-4ubuntu0.3) ... Setting up openssh-sftp-server (1:7.6p1-4ubuntu0.3) ... Setting up openssh-server (1:7.6p1-4ubuntu0.3) ... Creating SSH2 RSA key; this may take some time ... 2048 SHA256:5AdbGb5TQhr0muu4hOz49gdBC8iRRqonYXv0s0JUUHE root@DESKTOP-N53EEI1 (RSA) Creating SSH2 ECDSA key; this may take some time ... 256 SHA256:m1ibvVu6wqieTG8Yd98ocAHv3X6XqYCuhx56zq7Jgzc root@DESKTOP-N53EEI1 (ECDSA) Creating SSH2 ED25519 key; this may take some time ... 256 SHA256:SF2xPgLXsCG1Z6yEF7/+wrqTxxptiyuimxgnC7XVpwc root@DESKTOP-N53EEI1 (ED25519) invoke-rc.d: could not determine current runlevel Setting up ssh (1:7.6p1-4ubuntu0.3) ... h2s@DESKTOP-N53EEI1:~$ sudo service ssh status * sshd is not running h2s@DESKTOP-N53EEI1:~$ sudo apt-get install openssh-server Reading package lists... Done Building dependency tree Reading state information... Done openssh-server is already the newest version (1:7.6p1-4ubuntu0.3). The following packages were automatically installed and are no longer required: libgsoap-2.8.60 libvncserver1 Use 'sudo apt autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 174 not upgraded. h2s@DESKTOP-N53EEI1:~$ sudo service ssh start * Starting OpenBSD Secure Shell server sshd [ OK ] h2s@DESKTOP-N53EEI1:~$ sudo service ssh status * sshd is running h2s@DESKTOP-N53EEI1:~$
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