Temporary Fix - Virtualbox Error: VirtualBox can't operate in VMX root mode.
VirtualBox can't operate in VMX root mode.
disable the KVM kernel extension,
recompile your kernel and reboot
I was able to solve the problem by disabling the KVM kernel extension. :)
Commands used:
If you are using an Intel CPU
sudo modprobe -r kvm_intel
If you are using an AMD CPU
sudo modprobe -r kvm_amd