I have been trying to add the VBox repos from Oracle as shown in the info at Debian-based Linux distributions section at https://www.virtualbox.org/wiki/Linux_Downloads.
Currently there are no repos for focal so it is necessary at the moment to add the line for 19.10 to your sources.list file , ie, deb [arch=amd64] https://download.virtualbox.org/virtualbox/debian eoan contrib, using eoan instead of focal.
It is working just as it should for the time being in 20.04, and I will upgrade the repo information as soon as Oracle add a repo for focal.
Currently there are no repos for focal so it is necessary at the moment to add the line for 19.10 to your sources.list file , ie, deb [arch=amd64] https://download.virtualbox.org/virtualbox/debian eoan contrib, using eoan instead of focal.
It is working just as it should for the time being in 20.04, and I will upgrade the repo information as soon as Oracle add a repo for focal.