Comment 2 for bug 1624303

1. To install 9.0 version of MOS you should use exactly 9.0 version of the scripts and the VirtualBox.

2. Please refer the official documentation: https://docs.mirantis.com/openstack/fuel/fuel-9.0/quickstart-guide.html#supported-host-operating-systems-and-virtualbox-versions
and don't use the latest version of the VirtualBox binaries. 5.0 version can be found here: https://www.virtualbox.org/wiki/Download_Old_Builds_5_0

3. Please use scripts without modifications (we don't have 32Gb option in the release), and do not configure VirtualBox manually before start scripts to test installation.