Host:
Linux Mint 21.3

VirtualBox 6.1 + Extension Pack 6.1

Guest: Virtual machine: Windows 10

When I try to start virtual machine I get error:

Failed to open a session for the virtual machine Windows 10.

VirtualBox can't operate in VMX root mode. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_VMX_IN_VMX_ROOT_MODE).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}