If your system's graphics card is not supported by Live Media or your system does not have a graphics card, the system boots in console mode when you insert the media. In this case, you cannot perform a GUI installation.
You have two alternatives:
Use the text installer image instead of the Live Media ISO image.
You can run the text installer on the local console without network access. See Chapter 4, Using the Text Installer.
Perform a remote installation as described in How to Install Oracle Solaris From Live Media If Your System Boots in Console Mode.