I solved this problem, and will answer in case anyone else has a similar issue.
What I did was: I enabled the GUI of Virtual box to see that it was waiting for input on startup to select whether I wanted to boot directly to ubuntu or safemode etc.
To turn on the GUI you have to put this in your vagrant config Vagrantfile
:
config.vm.provider :virtualbox do |vb|
vb.gui = true
end