Problem:
When running apt update, you see the following error message:
Err:13 https://download.virtualbox.org/virtualbox/debian jammy InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A2F683C52980AECF
Solution:
This error occurs due to the VirtualBox repo using the outdated (as of April 2022) apt-key method of importing keys.
You can import the key by just installing the tailscale repo again (these commands are based on the commands from the VirtualBox Linux downloads page):
wget -qO- https://www.virtualbox.org/download/oracle_vbox_2016.asc | sudo gpg --dearmor --yes --output /usr/share/keyrings/oracle-virtualbox-2016.gpg echo "deb [arch=amd64 signed-by=/usr/share/keyrings/oracle-virtualbox-2016.gpg] https://download.virtualbox.org/virtualbox/debian $(lsb_release -cs) contrib" | sudo tee /etc/apt/sources.list.d/virtualbox.list
and then running
apt update
again.