Just a quick follow up regarding the 2.0.6 VirtualBox image --- a new build has been released (build number 1484941248). This build includes an increased base disk size (dynamically allocated up to 1 TB). The new build also automatically loads the VirtualBox Guest Additions Installation Disk so that setting up those Additions is as simple as possible (Guest Additions are used for sharing clipboard and directories between guest and host, among other things). If you have the previous build (1479486933), you might want to consider downloading this new version (accessible at the same link as above: https://data.qiime2.org/distro/core/qiime206.zip). You can determine which build you have by checking your VirtualBox Manager window - the build number is part of the default title:
Also, the old build can be accessed here.