Login as the root user or as a user that can execute sudo commands.
#open this file for editing...
vim /etc/ssh/sshd_config
Find the line that reads
Port 22
Change this to an different and an available port number…
Port 8000
Next reload ssh
/etc/init.d/ssh reload
You won’t be kicked out of your session. But if you want to open a new connection [...]
Change default ssh port number on Ubuntu