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.
If VirtualBox stuck on Saving state, your machine is in the hung state. Kill the VM via the Command Prompt, disable Core ...
If VirtualBox is not detecting the Graphics card, execute the solutions given below. Enable 3D Acceleration and increase VRAM Install the correct display driver in the Guest OS Allocate more system ...