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If you encounter the 'Rails: Command Not Found' error on Ubuntu 20.04, follow this comprehensive guide to resolve the issue and get your Ruby on Rails environment up and running.
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How to Resolve Rails: Command Not Found Issue on Ubuntu 20.04?

Encountering a "Rails: Command Not Found" error can be frustrating, especially when you're all set to start working on your Ruby on Rails project. This issue is quite common on Ubuntu 20.04 and there are a few steps you can take to resolve it. Here's a comprehensive guide to help you get your Rails command working perfectly.

Understanding the 'Rails: Command Not Found' Error

This error usually indicates that your system is unable to locate the Rails executable in your PATH. This could happen due to several reasons, including but not limited to:

Rails not being installed correctly.

PATH not being updated with the location of Rails.

Step-by-Step Solution

Ensure Ruby is Installed

First and foremost, ensure that Ruby is installed on your system. Open your terminal and run:

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If Ruby is not installed, you can install it via apt:

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Install Rails

Once Ruby is installed, you need to install Rails. You can do this by using the following command:

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After the installation is complete, verify it by running:

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Update PATH

Sometimes, the issue arises because the location of the Rails executable is not in your PATH. To ensure it is, you need to update your PATH variable.

Edit your .bashrc or .zshrc file in your home directory:

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Or

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Add the following line to your profile script:

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Note: Ensure you use the correct path where your Ruby gems are installed.

After editing the file, update your shell:

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Or

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Verify the Installation

Finally, verify that the Rails command is accessible:

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If everything is set up correctly, this command should return the version of Rails installed.

Alternative: Homebrew/Linuxbrew Approach

If you prefer using Homebrew or Linuxbrew, you can install Rails through this method as well:

Install Homebrew or Linuxbrew by following their installation instructions. Once installed, you can install Ruby and Rails through Brew:

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After the installation, ensure that the PATH variable is updated to include Homebrew's paths.

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Additionally, you can add Ruby gems to the PATH:

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And there you have it! By following these steps, you should be able to resolve the "Rails: Command Not Found" issue on your Ubuntu 20.04 system and continue with your Ruby on Rails development.