vagrant : Failed to mount folders in Linux guest, “vboxsf” file system is not available?

Question

I have VirtualBox 4.3.10 and Vagrant 1.4.3 installed on my Ubuntu 14.04 64 bit Desktop.

Earlier, worked with

Answer 1

 vagrant plugin install vagrant-vbguest

worked well for me (Virtual Box 5.0.22, Vagrant 1.8.4). It took muck longer to provision initially because the plugin downloaded gcc and a bunch of other tools before linking the guest additions .iso to the correct place.