The Xorg VESA driver does not work on Oracle VM VirtualBox if the Extensible Firmware Interface (EFI) is enabled, which means that the Live Media does not boot to Xorg. Therefore, a GUI installation is not possible.
Workaround: Perform the following steps:
Install Oracle Solaris 11.2 using the text installer or Automated Installer (AI).
For instructions about installing Oracle Solaris 11.2, see Installing Oracle Solaris 11.2 Systems.
Use the pkg command to install the solaris-desktop group package.
For instructions about installing the solaris-desktop group package, see Adding Software After Live Media Installation in Installing Oracle Solaris 11.2 Systems .
Install the VirtualBox guest tools that include the VirtualBox Xorg native driver.