Where does the System Information information come from on login?
The command is
landscape-sysinfo
it is run from /etc/update-motd.d/50-landscape-sysinfo when you have installed the package landscape-common.
As of Ubuntu 12.04 (perhaps earlier), update-motd is run at login time by the PAM module pam_motd.so. Originally, update-motd was a cron job.
landscape-sysinfo is a part of the package landscape-common, so if it's missing you can install it by the command:
sudo apt update && sudo apt install landscape-common