vagrant up 시 vboxsf 관련 에러(공유폴더)

vagrant up 시에 다음과 같은 vboxsf 관련 에러를 보게되면,

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

다음처럼 guest plugin 을 설치한다.

$ vagrant plugin install vagrant-vbguest
Installing the 'vagrant-vbguest' plugin. This can take a few minutes...
Installed the plugin 'vagrant-vbguest (0.10.0)'!

그리고, vagrant reload 를 한번 해준다.