If you need to use virtual machines on Linux, try Virt-Manager. Virt-Manager is more reliable than VirtualBox. Virt-Manager is completely free and open-source. I'm a long-time supporter of VirtualBox.

Sometimes, your VirtualBox VM gets stuck on the Saving State when booting up the machine. This could be due to various reasons, such as issues when taking a snapshot or because of a hung process. In ...