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Editorial Team
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Asked: 2026-06-14T00:46:30+00:00

I am attempting to install RoR on my Lubuntu box just setup today, I

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I am attempting to install RoR on my Lubuntu box just setup today, I have installed all of the rvm requirements installed Ruby. When I go to install rails I keep getting this error.

Running the command sudo gem install rails -V it looks like it’s trying to pull source for ruby 1.9.1 but I have 1.9.2 and then it fails out cannot load such file –mkmf (LoadError).

Any help would be much appreciated, this is my first adventure into Ruby so this is my first setup. Ask any questions and I will answer.

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1 Answer

  1. Editorial Team

    First, you need some RVM preinstallations, open terminal and type:

    $> sudo apt-get install curl git ruby1.8

    Then download and install RVM itself:

    $> curl -L get.rvm.io | bash -s stable

    After installing is done, load RVM:

    $> source ~/.rvm/scripts/rvm

    To check that RVM is installed as a function, type:

    $> type rvm | head -1

(it should output "rvm is a function")

    In order to work, RVM has some of it’s own dependencies that need to be installed. You can see what these are using:

    $> rvm requirements

    For Ruby / Ruby HEAD (MRI, Rubinius, & REE), install the following:

    $> sudo apt-get install build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion pkg-config

    Once you are using RVM, installing Ruby is easy:

    $> rvm install 1.9.3

    In newer version of Rails, you also need a Javascript runtime, so:

    $> sudo apt-add-repository ppa:chris-lea/node.js
$> sudo apt-get update
$> sudo apt-get install nodejs

    We can continue to use RVM to install gems:

    $> rvm rubygems current

    Once everything is set up, it is time to install Rails:

    $> gem install rails

    P.S.

    Postinstall & Troubleshooting.

    When we disable GNOME Terminal’s “Run command as login shell”, rvm unable to load as a function, so typing:

    $> type rvm | head -1

    outputs something like “rvm is /home/mercurial/.rvm/bin/rvm”.

    In order fix this, edit ~/.bashrc and add the following line in the end of file:

    [[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" # This loads RVM into a shell session.
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