Rsudio server not opening up using Ubuntu 20


I installed R and Rstudio on my ubuntu following this instructions:

When I try to sudo rstudio-server startI get the following error: TTY detected. Printing informational message about logging configuration. Logging configuration loaded from '/etc/rstudio/logging.conf'. Logging to '/var/log/rstudio/rstudio-server/rserver.log'.

I saw this topic RStudio Server Open-Source not working but couldn't manage to configurate the firewall.