I just edited your last response to remove your private key. Please note that this is a public forum, therefore, DO NOT SHARE credentials on this forum under any circumstance.
For security reasons, we do not access via SSH to our users servers. We can guide you to solve the issues by we cannot access your server.
As an alternative, you can try to launch ReportServer on any of the following clouds:
Those servers are Linux based and they'll provide you everything already installed. You can start working on your ReportServer application as soon as you deploy the server.