your machine doesn't support NFS (Ubuntu)

I'm using Ubuntu 14.04.1 LTS trusty.

➜  vagrant-sickrage git:(master) ✗ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.1 LTS
Release:    14.04
Codename:   trusty
➜  vagrant-sickrage git:(master) ✗ 

Upon vagrant up, I get the following error:

➜  vagrant-sickrage git:(master) ✗ vagrant up
Bringing machine 'coreos' up with 'virtualbox' provider...
==> coreos: Box 'coreos-alpha' could not be found. Attempting to find and install...
    coreos: Box Provider: virtualbox
    coreos: Box Version: >= 308.0.1
==> coreos: Loading metadata for box 'http://alpha.release.core-os.net/amd64-usr/current/coreos_production_vagrant.json'
    coreos: URL: http://alpha.release.core-os.net/amd64-usr/current/coreos_production_vagrant.json
==> coreos: Adding box 'coreos-alpha' (v399.0.0) for provider: virtualbox
    coreos: Downloading: http://alpha.release.core-os.net/amd64-usr/399.0.0/coreos_production_vagrant.box
    coreos: Calculating and comparing box checksum...
==> coreos: Successfully added box 'coreos-alpha' (v399.0.0) for 'virtualbox'!
==> coreos: Importing base box 'coreos-alpha'...
==> coreos: Matching MAC address for NAT networking...
==> coreos: Checking if box 'coreos-alpha' is up to date...
==> coreos: Setting the name of the VM: vagrant-sickrage_coreos_1327409530983_66532
It appears your machine doesn't support NFS, or there is not an
adapter to enable NFS on this machine for Vagrant. Please verify
that `nfsd` is installed on your machine, and try again. If you're
on Windows, NFS isn't supported. If the problem persists, please
contact Vagrant support.

How to fix it ?