I have some issues with Vagrant shared folders, my base system is Ubuntu 13.10 desktop.
I do not understand why I have this error is something that is not right conf
I believe this is the most updated answer now and it worked for me ( Guest Additions Version: 5.0.6, VirtualBox Version: 4.3.16, Ubuntu 14.04 LTS)
https://github.com/mitchellh/vagrant/issues/3341#issuecomment-144271026
Basically i says:
Simple and Quick Solution for Failed to mount folders in Linux guest issue.
Add the following line to your Homestead/Vagrantfile:
config.vbguest.auto_update = false
Your Homestead/Vagrantfile should looks like this:
/...
Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
# To avoid install and uninstall VBoxGuessAdditions during vagrant provisioning.
config.vbguest.auto_update = false
.../
Save it and execute
$ vagrant destroy --force
$ vagrant up