Retrieved from issues.guix.gnu.org/44301 <http://issues.guix.gnu.org/44301>
The problem was solved!
This time, during the installation process, I put the language, keyboard and all the names in English, and I was able to log in with my user (not the root) and update it. I hope this problem is solved soon. Yes, as I thought, this is related to issues.guix.gnu.org/43985 <http://issues.guix.gnu.org/43985>.