Enable VT-x in your BIOS security settings, ensure that your Linux distro has working KVM module

These simple steps solved my issue

1. Go the system BIOS. For thos who dont know how to get into bios- Restart computer- continusly press F2 (In my computer, it may be diffrent in yours)
2. Enable Intel Virtualization Technology (also known as Intel VT) or AMD-V depending on the brand of the processor. The virtualization extensions may be labeled Virtualization Extensions, Vanderpool or various other names depending on the OEM and system BIOS.
3. Save

I am working on Linux,Fedora 27 and I had same problem so I did this Solution:

1. Restart your computer and Go to the system BIOS (press Del or F2 (It is different in each system,my system is Del key))

2. In Advanced tab Choose,Cpu configuration and Enabled Intel Virtualization Technology,Finally Save the Changes and Restart Your Computer.