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Fixing Ruby Installation Build Failed Error on Ubuntu 20.04

Ubuntu 13

Ruby, a dynamic, open-source programming language, is widely used for its simplicity and speed. However, while installing Ruby on Ubuntu 20.04, you may encounter the “BUILD FAILED” error. This article will provide a step-by-step guide on how to resolve this issue.

Quick Answer

To fix the "BUILD FAILED" error when installing Ruby on Ubuntu 20.04, you need to ensure that you have all the necessary dependencies installed, such as build-essential, tklib, zlib1g-dev, libssl-dev, libffi-dev, libxml2, libxml2-dev, libxslt1-dev, and libreadline-dev. Additionally, you will need to install rbenv and ruby-build, update your shell configuration, and then proceed with installing the desired Ruby version using rbenv. Finally, set the installed Ruby version as the global default and verify the installation.

Prerequisites

Before we start, ensure that you have superuser privileges or access to an account with sudo permissions. You will also need a terminal window or command line prompt.

Installing Necessary Dependencies

The first step in resolving the “BUILD FAILED” error is to ensure that you have all the necessary dependencies installed on your Ubuntu system. These dependencies are required to build Ruby from source. Run the following command:

sudo apt install -y build-essential tklib zlib1g-dev libssl-dev libffi-dev libxml2 libxml2-dev libxslt1-dev libreadline-dev
  • sudo: This command allows you to run the following command with superuser privileges.
  • apt install: This command installs the specified packages.
  • -y: This option automatically answers ‘yes’ to all prompts.
  • The rest of the command lists the packages that will be installed.

Installing rbenv and ruby-build

The next step is to install rbenv and ruby-build. rbenv provides an easy way to install and manage versions of Ruby, and ruby-build is a plugin that adds the rbenv install command.

Run the following commands to clone rbenv and ruby-build from their GitHub repositories:

git clone https://github.com/rbenv/rbenv.git ~/.rbenv
git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
  • git clone: This command clones a repository into a new directory.
  • The URLs are the locations of the rbenv and ruby-build repositories.
  • ~/.rbenv and ~/.rbenv/plugins/ruby-build are the directories where rbenv and ruby-build will be installed.

Updating Shell Configuration

Next, update your shell configuration file to include rbenv. Add the following lines to the end of your .bashrc, .bash_profile, or .zshrc file:

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"
  • export PATH="$HOME/.rbenv/bin:$PATH": This line adds rbenv to your PATH, allowing you to run rbenv commands.
  • eval "$(rbenv init -)": This line initializes rbenv.

After adding these lines, save the file and reload the shell configuration by running source ~/.bashrc, source ~/.bash_profile, or source ~/.zshrc.

Installing Ruby

Now you’re ready to install Ruby. Run the following command, replacing VERSION with the desired Ruby version (e.g., 3.0.3):

rbenv install VERSION

If you encounter an error related to downloading the Ruby source file, you can manually download it from the official Ruby website and save it as ruby-VERSION.tar.gz in the ~/.rbenv/cache directory.

Setting the Default Ruby Version

After the installation completes successfully, set the installed Ruby version as the global default:

rbenv global VERSION

Replace VERSION with the Ruby version you installed.

Verifying the Installation

Finally, verify that Ruby is installed correctly by running ruby -v. It should display the installed Ruby version.

Conclusion

By following these steps, you should be able to resolve the “BUILD FAILED” error when installing Ruby on Ubuntu 20.04. If you encounter any further issues, please provide more specific details or error messages for further assistance.

What is the purpose of installing rbenv and ruby-build?

rbenv provides an easy way to install and manage versions of Ruby, while ruby-build is a plugin that adds the rbenv install command. Together, they make it simple to install and switch between different versions of Ruby on your system.

How can I check if I have superuser privileges or `sudo` access?

You can check if you have superuser privileges or sudo access by running the sudo -v command. If you have the necessary privileges, it will not prompt you for a password and will simply return to the command prompt. If you do not have the necessary privileges, it will prompt you for a password or display an error message.

Can I install a specific version of Ruby using rbenv?

Yes, you can install a specific version of Ruby using rbenv. When running the rbenv install command, specify the desired Ruby version as the argument (e.g., rbenv install 3.0.3). rbenv will download and install the specified version of Ruby.

How do I switch between different versions of Ruby using rbenv?

To switch between different versions of Ruby, use the rbenv global command followed by the desired Ruby version (e.g., rbenv global 3.0.3). This sets the specified version as the global default. Alternatively, you can use the rbenv local command to set a specific version for a particular directory.

How can I uninstall Ruby installed using rbenv?

To uninstall a Ruby version installed using rbenv, use the rbenv uninstall command followed by the Ruby version you want to remove (e.g., rbenv uninstall 3.0.3). This will remove the specified Ruby version from your system.

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