VirtualBox

Issue mounting failed with the error: No such device

   1 cd /opt/VBoxGuestAdditions-*/init  
   2 sudo ./vboxadd setup
   3 sudo reboot # apply changes
   4 

Issue VT-x is being used by another hypervisor

VT-x is being used by another hypervisor (VERR_VMX_IN_VMX_ROOT_MODE).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).

   1 sudo modprobe -r kvm_intel