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This is what I did to install VirtualBox 7.0 on my new Linux Mint 21.1 workstation.

See the VirtualBox Wiki for the deets on VirtualBox 7.0

1. Ensure your system has been updated:
   $ sudo apt update && sudo apt upgrade -y
2. Download the VirtualBox GPG Keys:
   $ curl https://www.virtualbox.org/download/oracle_vbox_2016.asc | gpg --dearmor > oracle_vbox_2016.gpg
$ curl https://www.virtualbox.org/download/oracle_vbox.asc | gpg --dearmor > oracle_vbox.gpg
3. Import the VirtualBox GPG Keys:
   $ sudo install -o root -g root -m 644 oracle_vbox_2016.gpg /etc/apt/trusted.gpg.d/
$ sudo install -o root -g root -m 644 oracle_vbox.gpg /etc/apt/trusted.gpg.d/
4. There does not appear to be an official repository for Linux Mint, but Linux Mint is derived from Ubuntu 22.04 which is code named ‘Jammy’. Add the Jammy VirtualBox Repository to the system:
   $ echo "deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian \
jammy contrib" | sudo tee /etc/apt/sources.list.d/virtualbox.list
5. Update the Repositories:
   $ sudo apt update
6. Install Linux Headers:
   $ sudo apt install linux-headers-$(uname -r) dkms
7. Install VirtualBox:
   $ sudo apt install virtualbox-7.0
8. Download the VirtualBox Extension Pack:
   $ cd ~/Downloads
$ VER=$(curl -s https://download.virtualbox.org/virtualbox/LATEST.TXT)
$ wget https://download.virtualbox.org/virtualbox/$VER/Oracle_VM_VirtualBox_Extension_Pack-$VER.vbox-extpack
9. Install the Extension Pack:
   $ sudo VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-*.vbox-extpack
10. You can now launch VirtualBox from the Desktop menu.