Today, when I used the Ubuntu18.04 subsystem under Windows to connect to the cloud host, a prompt "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!" suddenly appeared. The
reason was that the remote cloud host was previously reinstalled and the key verification failed, so I used vim Enter the ssh file to delete the remaining key file, the method is as follows:
sudo vim /home/user/.ssh/known_hosts
Among them, modify user to your username
Just delete it