ubuntu未开启ssh

安装netstat  sudo apt install net-tools

2）netstat -ntlp | grep 22  查看22端口是否打开

3）sudo apt install aptitude

4）aptitude search ssh-server  查看ssh-server是否安装

P v是未安装  i是安装

1. sudo apt install openssh-server
2. Aptitude search ssh-server

1. ssh -V 查看ssh版本   sudo ps -e | grep ssh
2. Sudo service ssh start
3. Securitycrt 连接ubuntu 报错

No compatible key exchange method. The server supports these methods: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256

解决办法，在/etc/ssh/sshd_config 中第118行增加

KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1