Using apt-keys

[david]

Folks

I tried installing Virtualbox in 20.04, and recent exchanges on the 
mailing list advised me to use the Oracle repository rather than the 
one built into the Ubuntu distribution.  Following one of the 
installation guides, I was asked to add a key to apt's keyring using 
apt-key.  This led me to a deprecated warning, and further research 
led me to a multi-step incomprehensible replacement for the one (or 
two, depending how you count) replacement for sequences like

sudo apt-key list

check to see if the Oracle key is already there. and if not, issue:

wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- 
| sudo apt-key add -


I would hope that the replacement to 'apt-key' is easy.  I can't 
believe that developers would replace a one-line commands with 
something complex.  Please advise.

Thanks

David