vagrant up したらエラーが出てしまったので、
解決までの道のりを書いていこうと思います。
そして、初めてのQiita投稿なので、投稿の練習として使わせてもらいます。
※文章構成考えずに書いてます。ほんとただのメモです。
立ち上げたら失敗
$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Clearing any previously set forwarded ports...
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
default: Adapter 1: nat
default: Adapter 2: hostonly
==> default: Forwarding ports...
default: 3306 => 33060 (adapter 1)
default: 22 => 2222 (adapter 1)
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
The guest machine entered an invalid state while waiting for it
to boot. Valid states are 'starting, running'. The machine is in the
'poweroff' state. Please verify everything is configured
properly and try again.
If the provider you're using has a GUI that comes with it,
it is often helpful to open that and watch the machine, since the
GUI often has more helpful error messages than Vagrant can retrieve.
For example, if you're using VirtualBox, run `vagrant up` while the
VirtualBox GUI is open.
The primary issue for this error is that the provider you're using
is not properly configured. This is very rarely a Vagrant issue.
原因
どうやら、VirtualBox5.0.2のバグらしいということで、、、
※詳しくは、下記参照
http://qiita.com/medaka5/items/d70751a562a5604c2115
当時（2016/1/12）の最新バージョンVirtualBox5.0.12をインストール
再度、立ち上げてみたら成功しました。