KVM not supported showing when installing for Docker in Ubuntu

Can you let me know what I am doing wrong to install the KVM in Virtual Machine Ubuntu that I see the error of “CPU does not support KVM extensions”?

I am running a Linux (Ubuntu 22.04.3 LTS) OS as a VM machine in VirtualBox (version 7.0) and My host machine is Windows 11 pro OS. My Virtualization is Enabled in the BIOS/UEFI of the host machine. I have turned off Hyper-V, Windows HyperVisor Platform, Virtual Machine Platform, and Windows Hypervisor Platform in the Windows Features. Then I have added the VM machine that trying to install KVM to the nested Virtualization by “VBoxManage modifyvm “YourVMName” --nested-hw-virt on” in my host PC. I have installed VM_VirtualBox_Extension_Pack-7.0.14 in Virtual Box.

I am trying to install Docker in my VM linux, for which I need the KVM. But after “sudo apt install qemu-kvm ovmf” it shows installed. But then after “sudo kvm-ok” I see the following error as KVM not supported in my machine:

"INFO: Your CPU does not support KVM extensions

KVM acceleration can NOT be used"

The linux architecture is in the following where KVM is also showed:

""Architecture: x86_64

CPU op-mode(s): 32-bit, 64-bit

Address sizes: 39 bits physical, 48 bits virtual

Byte Order: Little Endian

CPU(s): 4

On-line CPU(s) list: 0-3

Vendor ID: GenuineIntel

Model name: 11th Gen Intel(R) Core™ i9-11900 @ 2.50GHz

CPU family:          6

Model:               167

Thread(s) per core:  1

Core(s) per socket:  4

Socket(s):           1

Stepping:            1

BogoMIPS:            4991.99

Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mc

                     a cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall n

                     x rdtscp lm constant_tsc rep_good nopl xtopology nonsto

                     p_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 cx16 pci

                     d sse4_1 sse4_2 movbe popcnt aes rdrand hypervisor lahf

                     _lm abm 3dnowprefetch invpcid_single ibrs_enhanced fsgs

                     base bmi1 bmi2 invpcid rdseed clflushopt arat md_clear 

                     flush_l1d arch_capabilities

Virtualization features:

Hypervisor vendor: KVM

Virtualization type: full

Caches (sum of all):

L1d: 192 KiB (4 instances)

L1i: 128 KiB (4 instances)

L2: 2 MiB (4 instances)

L3: 64 MiB (4 instances)

Vulnerabilities:

Gather data sampling: Not affected

L1tf: Not affected

Mds: Not affected

Meltdown: Not affected

Mmio stale data: Vulnerable: Clear CPU buffers attempted, no microcode;

                     SMT Host state unknown

Retbleed: Mitigation; Enhanced IBRS

Spec rstack overflow: Not affected

Spec store bypass: Vulnerable

Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer

                      sanitization

Spectre v2: Mitigation; Enhanced / Automatic IBRS, RSB filling, PBR

                     SB-eIBRS SW sequence

Srbds: Not affected

Tsx async abort: Not affected

“”

It seems to be a VirtualBox question so I recommend asking about the right VirtualBox configuration for KVM support on a VirtualBox forum

https://forums.virtualbox.org/index.php

But if you have Windows 11, why don’t use install Docker Desktop for Windows and avoid nested virtualization?

Or if you run a virtual machine using VirtualBox to have a Linux server, you can install Docker CE which doesn’t require KVM.