Hello @mkrzyzanek and welcome to the community,
you have to start installation on a fresh Ubuntu 16.04 LTS. If you did so, please paste the output log in pastebin or a github gist and share the link here.
thanks
sorry for my late answer,
looks like that there is a problem with RabbitMQ on your system. Again I have to ask and make sure that you chose a fresh Ubuntu 16.04 LTS for the installation. did you?
Are you able to troubleshoot and fix the issue with RabbitMQ service on your server? then you can run the installation script from the beginning and it will continue to set up your system.
the other method could be restarting from the OS installation and retry installing Open edX. This time you may be lucky.
Yes, I am using fresh Ubuntu 16.04 for the installation. I noticed the issue with RabbitMQ but I am unable to troubleshoot it because I can’t really get any significant error message.
sudo service rabbitmq-server start
`Job for rabbitmq-server.service failed because the control process exited with error code. See "systemctl status rabbitmq-server.service" and "journalctl -xe" for details.`
you have to ask from an expert to help you,
you can still try to start from scratch and see if you are lucky this time.
in many cases this approach can really save your time.