$ 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: Forwarding ports...
    default: 80 => 8080 (adapter 1)
    default: 3000 => 3000 (adapter 1)
    default: 5432 => 5432 (adapter 1)
    default: 22 => 2222 (adapter 1)
==> default: Running 'pre-boot' VM customizations...
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address: 127.0.0.1:2222
    default: SSH username: vagrant
    default: SSH auth method: private key
    default: Error: Connection timeout. Retrying...
==> default: Machine booted and ready!
GuestAdditions 4.3.10 running --- OK.
==> default: Checking for guest additions in VM...
==> default: Mounting shared folders...
    default: /vagrant => /home/wsouto/Projetos/printo
Failed to mount folders in Linux guest. This is usually because
the "vboxsf" file system is not available. Please verify that
the guest additions are properly installed in the guest and
can work properly. The command attempted was:

mount -t vboxsf -o uid=`id -u vagrant`,gid=`getent group vagrant | cut -d: -f3` /vagrant /vagrant
mount -t vboxsf -o uid=`id -u vagrant`,gid=`id -g vagrant` /vagrant /vagrant

$ lsmod
Module                  Size  Used by
vboxsf                 42558  0 
vesafb                 13500  1 
nfsd                  247847  2 
auth_rpcgss            48552  1 nfsd
nfs_acl                12733  1 nfsd
nfs                   156370  0 
microcode              18894  0 
lockd                  78549  2 nfs,nfsd
sunrpc                230213  6 nfs,nfsd,auth_rpcgss,lockd,nfs_acl
fscache                55868  1 nfs
vboxguest             219348  2 vboxsf
ahci                   25579  2 
libahci                26619  1 ahci