Interesting. Looks like perhaps your boot loader isn’t properly pointing at your root partition.

I’m assuming you’ve just done the install and never successfully booted, yes? In that case, you can try to re-run the installer, or try rescue mode and try repairing the bootloader.

Are you doing dual-booting, or is this system dedicated to Linux?

Yes, back in the early 00s. We toyed with making a net-bootable image with it for our computer labs, but it was really not practical. It definitely taught me a ton about systems, though.

I admit, I’m not a big fan of putting more functionality into systemd (or just of systemd in general), but that is a well-reasoned argument for having sudo live in the init system.