Are you running Exadata Storage Server 18.104.22.168.0?
Have you tried to get a graphical tool, such as DBCA, DBUA or even VNC to run on your Exadata lately?
If, like me, you had quite the struggle until a friendly sysadmin installed a bunch of packages for you, you might be interested in reading this MOS note:
1969308.1 – Unable to run graphical tools (gui) on Exadata 22.214.171.124.0 or later.
I understand that Oracle have been increasingly hardening Exadata since the birth of their X3-2 machines, but you’d think that you wouldn’t need to add extra packages to a system that’s meant to be “ready to use” once your choice of consultant has finished with the Deployment Assistant.
After all, aren’t DBCA / DBUA Oracle’s tools of choice? Do they really want DBAs to spend their time creating response files and running these tools from the command line?