Oracle 11g/12c Solving Issue: "Check if the DISPLAY variable isset Failed"

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The Tip Show How-to Solve the Oracle 11g/12c Issue: “Check if the DISPLAY variable isset Failed”

  1. Open a New Terminal Window

  2. Execute on Terminal:

    export DISPLAY=:0.0

    Example: $export DISPLAY=127.0.0.1:0.0

    Then Open a New Terminal Window and Try

    xclock

    If you See the XClock to Pop-Up then you are Done!.

  3. If Still Not Solved Then Just Remove XServer Access Control

    Login as SuperUser

    sudo su

    Or on Non-Ubuntu Based OSs:

    su

    Then Execute:

    xhost +

    Then Open an New Terminal Window again and Try:

    xclock

    If Working then Follow with Installation in this Window…