Android Studio Emulator Error In Linux

I have the same message, but I do not think it has something to do with installing virtualbox but with the cpu, the emulator and the emulated system image (Android P). In my environments (linux, ubuntu 18.04 or debian 9) the message appears on my old sandybridge laptops but is not present on more modern skylake and kaby lake cpus and on all environments virtualbox is installed. However, the emulator seems to work fair enough on the sandy bridge machines with the warning. Let us hope that the old cpus continue to run the emulator for some time despite the warning and are not excluded by the emulator team @google in the near future.

Enable the VT-x option in BIOS and check the answer to enable KVM to run emulator.