The bug is on this page. (mod edit: this is the Linux Downloads page)
There is a syntax error in this command:
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sudo gpg --dearmor oracle_vbox_2016.asc --yes --output /usr/share/keyrings/oracle-virtualbox-2016.gpg
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gpg: Note: '--yes' is not considered an option
gpg: Note: '--output' is not considered an option
usage: gpg [options] --dearmor [file]
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sudo gpg --yes --output /usr/share/keyrings/oracle-virtualbox-2016.gpg --dearmor oracle_vbox_2016.asc