When launching the APM 10.7 Enterprise Manager installer on linux it fails with the following output
Preparing to install
Extracting the JRE from the installer archive...
Unpacking the JRE...
Extracting the installation resources from the installer archive...
Configuring the installer for this system's environment...
Installer User Interface Mode Not Supported
Unable to load and to prepare the installer in console or silent mode.
RHEL Linux environments
The problem relates to the presence of the DISPLAY system variable - used by X11 environments. If this is set to a location that is not reachable the problem occurs. If it is set to a location where an accessible X11 server is running then the installer continues - in console mode
To resolve this problem if you do not have an accessible X11 environment simply unset the DISPLAY variable and relaunch the installer.
To check if the DISPLAY variable is set enter
# echo $DISPLAY
to clear this
# unset DISPLAY
the echo $DISPLAY should then return nothing