Locked out of ubuntu server after installing OpenSSL

Try this: EC2 Serial Console for Linux instances

Please check if TCP port 22 is open in the instance's Network settings.

(replace REGION & INSTANCE_NAME with appropriate values):

https://lightsail.aws.amazon.com/ls/webapp/REGION/instances/INSTANCE_NAME/networking

If the port is open but you still can't SSH in, this means sshd server or some other network configuration is in invalid state. In this case, this article may help:

https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-create-an-instance-root-volume-snapshot

It shows how to make a disk snapshot and attach a disk created off this snapshot to another instance for data recovery purposes.