I have exactly the same problem and my user is also in the vboxusers
group.
Clicking "details" on the error box gives the following info:
Result Code:
NS_ERROR_FAILURE (0x80004005)
Component:
MachineWrap
Interface:
IMachine {85632c68-b5bb-4316-a900-5eb28d3413df}
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https://bugs.launchpad.net/bugs/1935945
Title:
Error in SUPR3Hardened Main
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