"Vagrant up" issue on ubuntu

Hi, could you help me with this problem?
Vagrant issue
My system is Ubuntu 18.04.4 LTS.
It seems something wrong with my ssh key?

Specify VirtualBox as your provider:
vagrant up --provision --provider virtualbox

Thank you for your reply.
I tried your solution but got a new issue with compatibility between Virtualbox and Vagrant. Reinstalling Vagrant from debian package helped me (updated v. from 2.0.2 to 2.2.7).
Issue is closed.

Closing this thread as the issue has been resolved.