ssh: connect to host example port 22: Connection refused

I have given the following command in the terminal:

ssh -L 8080:localhost:8888 bb@example

However, the following error appears:

ssh: connect to host example port 22: Connection refused

I have also tried:

sudo apt list --installed | grep openssh-server

But the following error appears:

The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit for information on installing Java.

When I type

sudo service ssh status

, This is the error I get:

sudo: service: command not found

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