Vagrant error : Failed to mount folders in Linux guest

Question

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

Answer 1

As mentioned in Vagrant issue #3341 this was a Virtualbox bug #12879.

It affects only VirtualBox 4.3.10 and was completely fixed in 4.3.12.