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So many awesome solutions! Thank you all so much!

I had a look and I'm definitely going to need to spend some more time on this, thanks for the directions.

After reinstalling vbox like @jpnilson suggested the usermod command now works, but as I said, now I have another problem.

Oh No... That just made it worse. Now it's rc(-1912), the error message I had before -1908, to wich I didn't even find a forum thread discussing it anywhere.

It's so strange to me, why I am even having this problem to begin with, since I'm not even running in secure boot.

I'm using Linux Mint 18 and I've already reinstalled Virtualbox from scratch about five times and I'm still having the problem. I have read in a MacOS forum, that this issue is because the oracle software is unsigned and by signing it yourself, you can resolve this issue. I would try this next...

I'm using Linux Mint 18 and I've already reinstalled Virtualbox from scratch about five times and I'm still having the problem. I have read in a MacOS forum, that this issue is because the oracle software is unsigned and by signing it yourself, you can resolve this issue. I would try this next...

I've been trying to solve this problem for days now. When I try to launch my Virtual Machine in Virtualbox 6.0 I get an error message: Failed to open a session for the virtual machine llllele. The virtual machine 'llllele' has terminated unexpectedly during startup with exit code 1 (0x1)...

Thanks for the help, however it did not work. I'm opening another thread.

Well I haven't solved the problem so far, so could you maybe help me? I still don't know how to get Virtual Machines running on my Laptop (rc 1908). I've read that in MacOS this error occurs because the Oracle software isn't signed and I think from what I've read on this topic about secure boot...

I think you need an authentication key for Virtualbox, to fix this error, but I don't know how to get the correct key.

Had the same problem. Typing "sudo virtualbox remove --purge" in Terminal completely uninstalled Virtualbox for me.