I upgraded to Fedora 40 last night, ran DNF update this morning, and then everything stopped working. On reboot the boot sequence halts at
Starting initrd-switch-root.service - Switching Root...
systemd-journald[281]: Received SIGTERM from PID 1 (systemd).
Anyone have any ideas as to why this is happening and, more importantly, how to fix this? Thanks!
Maybe an issue with a newer kernel.
Try booting the previous kernel. Does that work?
That did not work. I just ended up reloading the entire OS last night. 
Eric, why did you mark the answer as a solution? I have the same problem in Fedora 40, but I haven’t found a solution to prevent starting initrd-switch-root.service from ending in a forced system reboot (I mean, systemd-journald[425]: Received SIGTERM from PID 1 (systemd)).
Please start a new topic where we can help you debug this.