"sudo: /sbin/vboxconfig: command not found" Error while trying to start virtual machine

@anon51566685 has already linked you to the accurate solution.

Use whatever intelligence you might have to follow the directions, and extrapolate details as needed.

However, in the meantime, a little housekeeping…

Hi @ and welcome to the Manjaro community.

As a new user, please take some time to familiarise yourself with Forum requirements; in particular, the many ways to use the forum to your benefit. To that end, some or all these links will be invaluable:

And last, but not least, the Stable Update Announcements, which you should check frequently for important update related information. Occasionally an issue might be directly related to a particular update; it’s always best to check those announcements.

Do not ignore this.

Cheers.