I followed these instructions to install Syncthing on Ubuntu, but apparently the systemd unit files haven’t been installed correctly:
# systemctl status syncthing
Unit syncthing.service could not be found.
I found more instructions, but they seem to be incomplete. It says to create a user, but it doesn’t say which group, which home directory, which shell, nothing. For every other service this is handled by apt install, so I have no idea how to do it manually.