How Do You Know If Guest Additions Have Been Installed on Your Linux Guest Running Via Oracle VirtualBox on a Windows Host?

Question:  How do you find out if Guest Additions have been installed on your Linux guest running via Oracle VirtualBox on a Windows host?

Background  We find this message to be ignorable when installing Guest Additions:  "Could not find the or XFree86 Window System, skipping."

Go into the Linux guest and run this command:

lsmod | grep -i vbox

You should see results related to vbox.  If you see no results, then Guest Additions have not been installed.

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