How to activate CPU driver in Ubuntu 20.04

I am new to Linux. I installed Ubuntu on VirtualBox. I have install cpufreqtils by command :

trinh@TrinhHuy:~$ sudo apt install cpufreqtils 

Then I check the information of CPU.Here the output:

trinh@TrinhHuy:~$ cpufreq-info cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to , please. analyzing CPU 0: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. analyzing CPU 1: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. analyzing CPU 2: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. analyzing CPU 3: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. 

I also check the recommend driver for the system

trinh@TrinhHuy:~$ ubuntu-drivers devices == /sys/devices/pci0000:00/0000:00:04.0 == modalias : pci:v000080EEd0000CAFEsv00000000sd00000000bc08sc80i00 vendor : InnoTek Systemberatung GmbH model : VirtualBox Guest Service manual_install: True driver : virtualbox-guest-dkms - distro non-free driver : virtualbox-guest-dkms-hwe - distro non-free == /sys/devices/pci0000:00/0000:00:02.0 == modalias : pci:v000015ADd00000405sv000015ADsd00000405bc03sc00i00 vendor : VMware model : SVGA II Adapter driver : open-vm-tools-desktop - third-party free 

How can I activate the CPU driver OR the VirtualBox already provide me with CPU stimulation model : VirtualBox Guest Service? Please help !

Thanks for reading.

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