Comment 20 for bug 1569237

This is still an issue when using vagrant in xenial host,
with vbox 20160826.0.0

$ VBoxManage --version
5.0.24_Ubuntur108355

$ vagrant --version
Vagrant 1.8.5

$ vagrant box list | grep xenial
ubuntu/xenial64 (virtualbox, 20160826.0.0)

$ grep box Vagrantfile
    ubuntu.vm.box = "ubuntu/xenial64"

$ vagrant up
...
==> ubuntu: chown: invalid user: ‘vagrant:vagrant’
...

$ vagrant ssh
 INFO ssh: Invoking SSH: ssh ["ubuntu@127.0.0.1", "-p", "2222", "-o", "Compression=yes", "-o", "DSAAuthentication=yes", "-o", "LogLevel=FATAL", "-o", "StrictHostKeyChecking=no", "-o", "UserKnownHostsFile=/dev/null", "-o", "IdentitiesOnly=yes"]
ubuntu@127.0.0.1's password: