To prevent a security risk, the default functionality in this release of the Java Desktop System is that you cannot switch to virtual terminals.
Virtual terminals enable you to switch between different sessions on the same system using Ctrl+Alt+Function Key. These sessions can be either text-based console sessions, or graphical GNOME sessions created using Launch ->Applications ->Utilities ->New Login.
You can still create multiple GNOME sessions on the same computer using the New Login option. This is a secure operation as the screen lock is always invoked when you switch between GNOME sessions using the New Login option.
To enable virtual terminals, perform the following steps:
Log in as root.
Edit the following file /etc/X11/XF86Config.
Set the value of the DontVTSwitch in the ServerFlags section to false.
Reboot your system.