Chefを新しくしてrbenvをberkshellでvagrantのUbuntuにインストール ref: http://qiita.com/ychubachi@github/items/befe8ab4cd0765643628

Berksfile

diff --git a/Berksfile b/Berksfile
index 6d86dcf..b4fe769 100644
--- a/Berksfile
+++ b/Berksfile
@@ -2,3 +2,5 @@ site :opscode

 metadata
 cookbook 'git'
+cookbook 'ruby_build'
+cookbook 'rbenv', github: "fnichol/chef-rbenv"

file0.txt

$ vagrant plugin install vagrant-omnibus
Installing the 'vagrant-omnibus' plugin.  This can take a few minutes...
Installed the plugin 'vagrant-omnibus (1.1.0)'!

file1.txt

$ vagrant plugin list
vagrant-berkshelf (1.3.2)
vagrant-omnibus (1.1.0)

file5.txt

$ vagrant provision

file6.txt

$ vagrant ssh
vagrant@precise:~$ rbenv versions
  system
* 2.0.0-p195 (set by /home/vagrant/.rbenv/version)
vagrant@precise:~$ ruby -v
ruby 2.0.0p195 (2013-05-14 revision 40734) [i686-linux]

Vagrantfile

diff --git a/Vagrantfile b/Vagrantfile
index e3a5d5d..87555d2 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -77,12 +77,26 @@ Vagrant.configure("2") do |config|
         :server_root_password => 'rootpass',
         :server_debian_password => 'debpass',
         :server_repl_password => 'replpass'
+      },
+      rbenv: {
+        user_installs: [{
+          user: "vagrant",
+          rubies: ["2.0.0-p195"],
+          global: "2.0.0-p195",
+          gems: {
+            "2.0.0-p195" => [
+              {name: "bundler"}
+            ]
+          }
+        }]
       }
     }

     chef.run_list = [
         "recipe[precise::default]",
-        "git"
+        "git",
+        "ruby_build",
+        "rbenv::user"
     ]
   end
 end