I tried almost all versions of official ubuntu, bento/ubuntu-16.04, debian jessie and they used to work and now they don't.
Every image starts to fail. It's either related unable to mount because vboxsf is missing incase of debian jessie or network failure in all latest ubuntu versions. I am so frustrated almost feels like I have to find native windows tools for the tasks that I have to do.
It's either serious quality control issue or no body gives a hoot about vagrant standards or testing when making images.