Install VirtualBox 7.1 on Ubuntu 24.04

I am attempting to install VirtualBox 7.1 on Ubuntu 24.04. I have downloaded and installed the Oracle key oracle-virtualbox.asc. When I try to do sudo apt update, apt complains that there is no Release file present. I checked the documentation for apt and found that this message can also be issued if the Release file is not signed or if it is signed, but no key for the Release file is present on the user’s system. I noticed that there is a file named Release.gpg. Is that the key file for the Release and if so how should it be installed?