Rails ans SQLite3 on Ubuntu

To configure a Rails application in order to use SQLite3 please follow the following steps:

sudo apt-get install  sqlite3 swig libsqlite3-ruby libsqlite3-dev
 sudo gem install sqlite3-ruby

Then create a Rails application as usual and update the environment.rb file in the following way

Rails::Initializer.run do |config|
...
config.gem 'sqlite3-ruby', :lib => "sqlite3"
...
end