I wanted to try the Pantheon DE on Ubuntu 18.04. I installed it based on this guide: https://linuxconfig.org/how-to-install-pantheon-desktop-on-ubuntu-18-04-linux-desktop
After the reboot I changed it to Pantheon desktop but I wasn't able to login. Black screen for a few seconds and after the sound of unsuccessful login it went back to the login screen.
Is there any solution for this?