therubyraceronubuntu12.04

If you had problems to use the gem therubyracer on Ubuntu 12.04LTS after install 

$gem install therubyracer

You just need to delete v8 library before install therubyracer, so...

$gem uninstall libv8
$gem install therubyracer

ok... if you did that and the rails still asking "Please install gem therubyracer", don't worry. Just edit the gemfile:

add:

  gem 'execjs' on line 9

and uncomment therubyracer gem on line 18:

gem 'therubyracer', :platforms => :ruby

and be happy!


My gemfile after edition:

  1 source 'https://rubygems.org'
  2 
  3 gem 'rails', '3.2.8'
  4 
  5 # Bundle edge Rails instead:
  6 # gem 'rails', :git => 'git://github.com/rails/rails.git'
  7 
  8 gem 'sqlite3'
  9 gem 'execjs'
 10 
 11 # Gems used only for assets and not required
 12 # in production environments by default.
 13 group :assets do
 14   gem 'sass-rails',   '~> 3.2.3'
 15   gem 'coffee-rails', '~> 3.2.1'
 16 
 17   # See https://github.com/sstephenson/execjs#readme for more supported runtimes
 18     gem 'therubyracer', :platforms => :ruby
 19 
 20   gem 'uglifier', '>= 1.0.3'
 21 end
 22 
 23 gem 'jquery-rails'
 24 
 25 # To use ActiveModel has_secure_password
 26 # gem 'bcrypt-ruby', '~> 3.0.0'
 27 
 28 # To use Jbuilder templates for JSON
 29 # gem 'jbuilder'
 30 
 31 # Use unicorn as the app server
 32 # gem 'unicorn'
 33 
 34 # Deploy with Capistrano
 35 # gem 'capistrano'
 36 
 37 # To use debugger
 38 # gem 'debugger'