how to start recovery mode for Ubuntu Server 18.04.3 LTS when connecting through SSH?

[natiya]

I have a virtual machine running Ubuntu Server 18.04.3 LTS and I need to modify some settings using the recovery Mode. I have to connect through a VPN using SSH (Putty), so I'm not sure what the sequence would be to do this, as I think if I restart it, I'll loose the connection in Putty, right?