Thank you for your interest in Kali but this bug report is not actionable. Please read https://kali.training/chapter-6/filing-a-good-bug-report/ first. We are a small team and we expect you to provide a much more detailed bug report.

Once you have done the necessary research (possibly with the help of the community on http://forums.kali.org or on IRC #kali-linux on irc.freenode.net), feel free to re-open this bug with more information or to open a new report.

Note that that this is likely not a bug, just a virtualbox configuration issue. You should really document yourself a little bit.