reu

set :rails_env,      "production"
set :passenger_port, 9292
set :passenger_cmd,  "#{bundle_cmd} exec passenger"

namespace :deploy do
  task :start, :roles => :app, :except => { :no_release => true } do
    run "cd #{current_path} && #{passenger_cmd} start -e #{rails_env} -p #{passenger_port} -d"
  end

  task :stop, :roles => :app, :except => { :no_release => true } do

fabioyamate

# installing curb gem on Ubuntu require libcurl

sudo apt-get install libcurl3-dev

Or new version, but it conflicts if some libraries.

sudo apt-get install libcurl4-dev
(some other packages  libcurl4-openssl-dev libcurl4-gnutls-dev)

gem install curb