Software⏱️ 3 min read📅 2026-06-11

How to Fix: CUDA 9.1 installation error: does not have a version.txt file! Ensure you are installing to an existing toolkit directory

CUDA installation error fix for Linux.

Quick Answer: Ensure the installation directory is an existing toolkit directory, and try installing in a different location.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🚀 How to Resolve This Issue
  3. ✨ Wrapping Up

The error 'CUDA 9.1 installation error: does not have a version.txt file! Ensure you are installing to an existing toolkit directory' affects users who attempt to install CUDA 9.1 on systems that already have CUDA 8.0 installed. This issue can be frustrating for developers and researchers who rely on the latest version of CUDA for their projects.

The primary reason for this error is due to the fact that the installation process is trying to write over an existing toolkit directory, which does not contain a version.txt file. This is because the system already has CUDA 8.0 installed, and the installer is attempting to install CUDA 9.1 on top of it.

🔍 Why This Happens

  • The primary reason for this error is that the installation process is trying to write over an existing toolkit directory, which does not contain a version.txt file. This can happen when the system already has an older version of CUDA installed and the installer tries to install a newer version on top of it.
  • Another possible cause could be if the system's environment variables are not set correctly, causing the installation process to fail.

🚀 How to Resolve This Issue

Update the environment variables before installing

  1. Step 1: Set the PATH variable to point to a directory that does not contain any existing CUDA toolkit directories.
  2. Step 2: Use the following command to update the PATH variable: export PATH=$HOME/local/bin:$PATH
  3. Step 3: Restart the terminal or run the installer again after updating the environment variables.

Install CUDA 9.1 in a separate directory

  1. Step 1: Create a new directory to install CUDA 9.1, for example: mkdir /usr/local/cuda-9.1
  2. Step 2: Change into the newly created directory using the following command: cd /usr/local/cuda-9.1
  3. Step 3: Run the installer again in this new directory to avoid overwriting any existing files.

✨ Wrapping Up

To resolve the 'CUDA 9.1 installation error: does not have a version.txt file! Ensure you are installing to an existing toolkit directory' issue, try updating the environment variables or installing CUDA 9.1 in a separate directory. By following these steps, you should be able to successfully install CUDA 9.1 on your system.

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