root@toolbox-kontenerowiec4-ubuntu:/opt/seadas# sh ./seadas_8.1.0_linux64_installer.sh --nox11 --accept
Verifying archive integrity... 100% All good.
Uncompressing SeaDAS by Ocean Ecology Lab 100%
Command line arguments:
SEVERE: com.izforge.izpack.api.exception.IzPackException: Console implementation not found for panel: com.izforge.izpack.panels.installationtype.InstallationTypePanel
On a system with java-1.8.0-openjdk JDK and see the same issue. On a system with X11, the installer opens a GUI window. For IzPack, "-console" is supposed to support a console installation, but adding "-- -console" gives the same "SEVERE" error.
Since SeaDAS 8 is a GUI, you will eventually need X11 (or wayland). It might be useful to mention more details of your use case. It is often possible to use xvfb to provide X11 for batch processing (e.g., with software that used X11 fonts to create png images).