Try the following steps:

$ sudo apt update
$ sudo apt upgrade
$ sudo apt install curl
$ curl -fsSL https://www.virtualbox.org/download/oracle_vbox_2016.asc | sudo gpg –dearmor -o /usr/share/keyrings/virtualbox-archive-keyring.gpg
$ echo “deb [arch=amd64 signed-by=/usr/share/keyrings/virtualbox-archive-keyring.gpg] http://download.virtualbox.org/virtualbox/debian noble contrib” | sudo tee /etc/apt/sources.list.d/virtualbox.list
$ sudo apt update
$ sudo search virtualbox

virtualbox/noble-updates 7.0.16-dfsg-2ubuntu1.1 amd64 x86 virtualization solution - base binaries

virtualbox-7.0/unknown 7.0.24-167081~Ubuntu~noble amd64 Oracle VM VirtualBox

virtualbox-7.1/unknown 7.1.6-167084~Ubuntu~noble amd64 Oracle VirtualBox

$ sudo install virtualbox-7.1

Download the Extension Pack frm the website: https://www.virtualbox.org/wiki/Downloads