There was an error while trying to write to Gemfile.lock. It is likely that
you need to allow write permissions for the file at path:
/usr/share/redmine/Gemfile.lock (Bundler::InstallError)
  /var/lib/gems/1.9.1/gems/bundler-1.5.3/lib/bundler/definition.rb:259:in `rescue in lock'
  /var/lib/gems/1.9.1/gems/bundler-1.5.3/lib/bundler/definition.rb:244:in `lock'
  /var/lib/gems/1.9.1/gems/bundler-1.5.3/lib/bundler/environment.rb:34:in `lock'
  /var/lib/gems/1.9.1/gems/bundler-1.5.3/lib/bundler/runtime.rb:44:in `setup'
  /var/lib/gems/1.9.1/gems/bundler-1.5.3/lib/bundler.rb:119:in `setup'
  /var/lib/gems/1.9.1/gems/bundler-1.5.3/lib/bundler/setup.rb:17:in `<top (required)>'
  /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:60:in `require'
  /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:60:in `rescue in require'
  /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:35:in `require'
  /usr/lib/ruby/vendor_ruby/phusion_passenger/loader_shared_helpers.rb:245:in `block in run_load_path_setup_code'
  /usr/lib/ruby/vendor_ruby/phusion_passenger/loader_shared_helpers.rb:348:in `running_bundler'
  /usr/lib/ruby/vendor_ruby/phusion_passenger/loader_shared_helpers.rb:243:in `run_load_path_setup_code'
  /usr/share/passenger/helper-scripts/rack-preloader.rb:100:in `preload_app'
  /usr/share/passenger/helper-scripts/rack-preloader.rb:158:in `<module:App>'
  /usr/share/passenger/helper-scripts/rack-preloader.rb:29:in `<module:PhusionPassenger>'
  /usr/share/passenger/helper-scripts/rack-preloader.rb:28:in `<main>'