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I'm assuming by the above command you're trying to add yourself to vboxsf group.

The command to add a user to another group is actually, "sudo usermod -a -G <group> <user>".
So in your case try:


You will need to logout/reboot the guest for this to take affect.

If you type "id" into the terminal it will list all the groups you belong to, a good way to check which groups you are a member of

Hope this helps.