## \'No X11 DISPLAY Variable\' Error on Linux: How Do I Fix It?

"No X11 DISPLAY Variable" - An Overview

While installing a Java application on Linux, you may encounter the error "No X11 DISPLAY variable was set," indicating that a crucial variable is missing. This variable is vital for programs that require a graphical user interface (GUI).

Addressing the Problem

To resolve this issue, you need to set the X11 DISPLAY variable to an appropriate value, depending on your specific usage scenario.

Main Display

If you're working on the main display, set the variable using the following command:

export DISPLAY=:0.0

Other Shell Types

If you're using csh or tcsh, use this command instead:

setenv DISPLAY :0.0

Execute this command before launching the application.

Additional Considerations

Usually, the DISPLAY variable is set automatically. If you're not using a graphical terminal, verify the default shell configuration files such as .profile, .login, .bashrc, or .cshrc.

Setting the DISPLAY variable to :0.0 assumes you're using the main display or connected under your user ID. If not, the setting may fail.

Remote Access

If you're accessing a remote machine with X running and connected to the main display, you can use "ssh -X hostname" to establish a connection. SSH will automatically set the DISPLAY variable to indicate the socket tunneling to your local system (e.g., "localhost:11.0").

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