Had the same problem after upgrading from 37 to 38. Its an nvidia problem

1 - Boot an older kernel OR Drop to a TTY (Ctrl + Alt + F3) OR Boot into runlevel 3 (on grub, press 'e' when the list of kernels show, look for the line with quite splash nvidia-drm.modeset=1 and add the number 3 there, then Ctrl + X to boot) 2 - Login on your terminal and dkms status. If you see something like /var/dkms/nvidia/525.116.03/source/dkms.conf does not exist, remove the entire directory of the failed version rm -rf /var/dkms/nvidia/525.116.03 3 - sudo dkms autoinstall 4 - reboot if no errors and profit, otherwise rinse and repeat step 2-3

PS: If dkms tells you nothing at all (after the upgrade): remove the drivers /etc/nobara/scripts/cosmo-nvidia-wizard/remove.sh

reinstall them /etc/nobara/scripts/cosmo-nvidia-wizard/install.sh

If your dkms status is ok, you probably have a mismatch in your initramfs and root. just sudo dracut -f --regenerate-all and reboot

Thats what i have done now it works fine.