Can't log into GUI after upgrade.

Hello everyone, hope you all are doing fine.

My problem started when I decided to upgrade my kali from 2019.2 to 2020.1. As I was experiencing poor network, I decided to download the full live 64bit iso. I followed the proper procedure (mounting, then adding the filepath to my sources file and then ran update & upgrade).

I wasn't asked to create a new user (I was using root).

Anyway, on completion, I restart and I can't login to my root profile so I go in via ttl and I can login and all documents intact. So, I create a new user and password, restart and it also appears on the login page.

I try to access it without success.

So I go back to tty and I can log in to the new profile.

I'm lost as to why