Noticed that Vagrant 1.4.3 no longer syncs folders after upgrading to VirtualBox 4.3 with Ubuntu 13.04/13.10

the cause

seems like most of the images that are used by vagrant use an oudated version of the Guest Additions (at 4.2) which do not work with 4.3

fixing up guest additions

we start by installing the guest additions plugin

vagrant plugin install vagrant-vbguest  

append xorg server to the bootstrap.sh (guest additions won't work without it)

  apt-get update
  apt-get upgrade --yes
  ...

  apt-get install xorg

  ...

  apt-get autoremove
  apt-get clean

finally, re-run the provisioning

vagrant up --provision  

I published my vagrant setup on https://github.com/MaxPresman/vagrant-config