Software⏱️ 3 min read📅 2026-06-11

How to Fix: Windows 10 Ubuntu X11 with Xming (xterm: Xt error: Can't open display: localhost:0.0)

Xterm error on Windows 10 Ubuntu X11 with Xming, unable to open display localhost:0.0.

Quick Answer: Check if the DISPLAY environment variable is set correctly in your Windows 10 system variables.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🔧 Proven Troubleshooting Steps
  3. 💡 Conclusion

The error 'xterm: Xt error: Can't open display: localhost:0.0' occurs when Ubuntu applications on Windows 10 are unable to connect to the X11 display server, which is a common issue for users running Ubuntu on Windows. This problem affects users who have installed Xming and are trying to run Ubuntu applications that require X11 support.

This error can be frustrating because it prevents users from accessing certain features or functionality in their Ubuntu applications. However, by following the steps outlined below, users should be able to resolve this issue and continue using their Ubuntu applications on Windows 10.

🔍 Why This Happens

  • The primary reason for this error is that Xming does not automatically create a ~/.Xauthority file, which is required for X11 connections. Without this file, the X11 display server cannot authenticate the user's connection, resulting in the 'Can't open display' error.
  • An alternative cause could be that the Xming installation or configuration is incomplete or incorrect, leading to issues with the X11 display server.

🔧 Proven Troubleshooting Steps

Creating a ~/.Xauthority file using xauth

  1. Step 1: Open a terminal on your Windows 10 system and navigate to the directory where you want to create the ~/.Xauthority file.
  2. Step 2: Use the command `xauth generate :0 . trusted` to create a new X11 authority file. This command will prompt for a password, which should be the same as the one used when setting up Xming.
  3. Step 3: If prompted, enter the password and press Enter to continue. The xauth command will then create a new ~/.Xauthority file in your home directory.

Alternative method: Configuring Xming for automatic authority file creation

  1. Step 1: Open the Xming configuration settings by right-clicking on the Xming icon in the system tray and selecting 'Settings'.
  2. Step 2: In the Xming settings, navigate to the 'Display' tab and check the box next to 'Create .Xauthority file automatically for each display'.
  3. Step 3: Save the changes and restart Xming. This will create a new ~/.Xauthority file for you when you start Xming.

💡 Conclusion

To resolve the 'xterm: Xt error: Can't open display: localhost:0.0' issue, follow one of the two methods outlined above. By creating a ~/.Xauthority file using xauth or configuring Xming to create an automatic authority file, you should be able to connect your Ubuntu applications to the X11 display server and resolve this error.

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