I’m relatively new to Linux also, so I can’t help with that error specifically, but it may help people to understand what choices you made during installation, which filesystem, bootloader and so on. [edit] perhaps what machine you are trying to run on, CPU, GPU, memory etc.
Also those commands look strange, surely you mean
“journalctl -xb” to view system logs
“systemctl reboot” to reboot
so type the first command as I have written above and then copy the output here?