Yes, it is absolutely possible to install Oracle VirtualBox on a Linux system and run virtual machines. In fact, Linux is a very common host operating system for VirtualBox.
VirtualBox offers packages for various Linux distributions, making the installation process relatively straightforward. You can typically install it using your distribution’s package manager (like apt for Debian/Ubuntu, dnf for Fedora, pacman for Arch, etc.) or by downloading a pre-built binary from the VirtualBox website.
Once installed, you can create and manage virtual machines running various guest operating systems, including Windows, macOS (with some limitations), other Linux distributions, and more.