Software⏱️ 2 min read📅 2026-05-31

How to Fix: How do I fix a "cannot open display" error when opening an X program after ssh'ing with X11 forwarding enabled?

Cannot open display error when opening X program after ssh with X11 forwarding enabled.

Quick Answer: Enable X11 forwarding on the Ubuntu VM and set the DISPLAY environment variable before running the application.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

The 'cannot open display' error occurs when the X server is not properly configured to work with SSH. This can be due to several reasons, including issues with the DISPLAY environment variable or problems with the X11 forwarding mechanism.

🔍 Why This Happens

  • When you enable X11 forwarding with SSH, the remote server's DISPLAY environment variable is not properly set. This causes the local application to be unable to open a display.

✅ Best Solutions to Fix It

Method 1: Enable Local X11 Forwarding

  1. Step 1: Open the SSH client settings and enable local X11 forwarding.

Method 2: Set DISPLAY Environment Variable

  1. Step 1: Run the command `export DISPLAY=:0` before launching the X11 application.

✨ Wrapping Up

By following these steps, you should be able to resolve the 'cannot open display' error and successfully run X11 applications on your remote server.

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