I am trying to deploy an Rails app (unicorn, nginx).
Using:

require 'capistrano/rvm'
require 'capistrano/bundler'
require 'capistrano/rails/assets'
require 'capistrano/rails/migrations'
And tried to run after 'deploy:finished':
execute "cd #{release_path} && bundle exec unicorn -c #{release_path}/config/unicorn.rb -E #{fetch(:stage)} -D"

I get a

DEBUG[72b6d5f6] Command: bundle exec unicorn -c /home/mb/st/staging/releases/20140715135329/config/unicorn.rb -E staging -D
DEBUG[72b6d5f6]     bash: /usr/local/bin/bundle: /usr/bin/ruby1.8: bad interpreter: No such file or directory

Ubuntu 14.04 x84