updating RubyGems on Ubuntu

Question

Does anybody know how to update RubyGems on Ubuntu. The usual way doesn't work:

steve@ubuntu:~$ rails /home/steve/www/mynewapp -d mysql
      create  
      create  app/controllers
      create  app/helpers
      create  app/models
      create  app/views/layouts
      create  config/environments
      create  config/initializers
      create  config/locales
      create  db
      create  doc
      create  lib
      create  lib/tasks
      create  log
      create  public/images
      create  public/javascripts
      create  public/stylesheets
      create  script/performance
      create  test/fixtures
      create  test/functional
      create  test/integration
      create  test/performance
      create  test/unit
      create  vendor
      create  vendor/plugins
      create  tmp/sessions
      create  tmp/sockets
      create  tmp/cache
      create  tmp/pids
      create  Rakefile
      create  README
      create  app/controllers/application_controller.rb
      create  app/helpers/application_helper.rb
      create  config/database.yml
      create  config/routes.rb
      create  config/locales/en.yml
      create  db/seeds.rb
      create  config/initializers/backtrace_silencers.rb
      create  config/initializers/inflections.rb
      create  config/initializers/mime_types.rb
      create  config/initializers/new_rails_defaults.rb
      create  config/initializers/session_store.rb
      create  config/environment.rb
      create  config/boot.rb
      create  config/environments/production.rb
      create  config/environments/development.rb
      create  config/environments/test.rb
      create  script/about
      create  script/console
      create  script/dbconsole
      create  script/destroy
      create  script/generate
      create  script/runner
      create  script/server
      create  script/plugin
      create  script/performance/benchmarker
      create  script/performance/profiler
      create  test/test_helper.rb
      create  test/performance/browsing_test.rb
      create  public/404.html
      create  public/422.html
      create  public/500.html
      create  public/index.html
      create  public/favicon.ico
      create  public/robots.txt
      create  public/images/rails.png
      create  public/javascripts/prototype.js
      create  public/javascripts/effects.js
      create  public/javascripts/dragdrop.js
      create  public/javascripts/controls.js
      create  public/javascripts/application.js
      create  doc/README_FOR_APP
      create  log/server.log
      create  log/production.log
      create  log/development.log
      create  log/test.log
steve@ubuntu:~$ cd /home/steve/www/mynewapp
steve@ubuntu:~/www/mynewapp$ ruby script/server
Rails requires RubyGems >= 1.3.2 (you have 1.3.1). Please `gem update --system` and try again.
steve@ubuntu:~/www/mynewapp$ gem update --system
ERROR:  While executing gem ... (RuntimeError)
    gem update --system is disabled on Debian. RubyGems can be updated using the official Debian repositories by aptitude or apt-get.

Answer 1

Seems like you installed rubygems from Debian/apt-get package.

If you're on Ubuntu 9.04 or later, this might work:

sudo gem install rubygems-update
sudo update_rubygems

Otherwise, remove the package and install rubygems from source, which is the recommended way to install rubygems anyway:

sudo apt-get remove rubygems
wget http://rubyforge.org/frs/download.php/60718/rubygems-1.3.5.tgz
tar xzvf rubygems-1.3.5.tgz
cd rubygems-1.3.5
sudo ruby setup.rb
sudo ln -s /usr/bin/gem1.8 /usr/bin/gem
sudo gem update --system

More resources: Ruby on Rails installation on Ubuntu.

Answer 2

This website runs through the installing rails and rubygems on ubuntu if you need it

http://www.ubuntugeek.com/how-to-install-ruby-on-rails-in-ubuntu-810-intrepid.html

Answer 3

Also you may find this cool

http://github.com/lexrupy/gmate

This guy has made gedit more textmatey which is awesome. Heres what you do:

Install on Ubuntu Karmic

1. Add Ubuntu on Rails PPA in System → Administration → Software Sources on Third Party Software tab:

   ppa:ubuntu-on-rails/ppa
   

2. Install gedit-gmate package:

   $ sudo apt-get install gedit-gmate
   

Then just oped gedit goto > Edit > Prefrences

In preferences you can change the fonts and colours Black Pearl II is good and add the extra cool plugins. Hope you like all these cool added features.