Thanks, yes it is related, I was able to install the system by putting "nomodeset" in grub. [Attachment 1] With this problem: https://issues.guix.gnu.org/43985 Which is probably related to GDM or graphics, I was able to log in with the root user. I then updated the system with the "guix pull" and "guix system reconfigure /etc/config.scm" commands. To apply the updates, I rebooted the system and then I now have this problem: [Attachment 2] [Attachment 3] My graphics card: NVIDIA GT720