Android emulator and virtualbox cannot run at same time

Question

Whenever I have Virtualbox running, I cannot start an Android emulator image (and vice versa). The error message in the AVD manager is

ioctl(KVM_CREATE_VM) f         


        

Answer 1

This might be out of topic, due to the fact that OP requested VirtualBox + KVM in the same time, but still, it might be the workaround: I was looking for a way to launch Windows 7 and AVD on Ubuntu 18.10 x64. Turning off KVM is not an option due to the fact that performance of AVD is critical to me. I have installed Windows 7 via Virtual Machine Manager (virt-manager package) and now both the AVD and Windows 7 are hardware accelerated.