The Lotus Domino Server software is installed -- but just as on Windows Server, you must perform a setup process the first time that Domino Server runs:
Type exit to log out as root.
Log back in as notes.
Type startx to start the X Window System and the GNOME desktop.
Open a GNOME Terminal session by clicking on the Computer icon in the lower-left and choosing the GNOME terminal.
Within the terminal session, type cd /local/notesdata, then /opt/ibm/lotus/bin/server.
Configure the Domino server as you normally would on any operating system.
When configuration is finished, type exit to leave the terminal session.
Click on Computer / Logout to leave the GNOME session.