Yes, downgrading the version helped. I reinstalled everything. But it seems strange.
rasa@rasa-rasa-x-5f568f989-2q6nb:~$ rasa --version
Rasa Version : 2.5.0
Minimum Compatible Version: 2.2.0a1
Rasa SDK Version : 2.5.0
Rasa X Version : 0.39.3
Python Version : 3.8.5
Operating System : Linux-5.4.0-80-generic-x86_64-with-glibc2.29
Python Path : /usr/bin/python3