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Please always read README files.

Always.

Do you want to fix this warning, otherwise qemu will be very slow.

Install kvm:

    $ sudo apt install qemu-kvm

Make sure that you can access /dev/kvm . You can easily check with

    $ file -s /dev/kvm

that you properly get "ERROR: cannot read `/dev/kvm' (Invalid argument)",
which means that "file" was properly able to open kvm, just not smart enough
to use it :)

If you get "cannot open `/dev/kvm' (No such file or directory)", check in your
BIOS setup to make sure that accelerated virtualization is activated, and make
sure that the `kvm_intel` or `kvm_amd` module is loaded.

If you get "no read permission", make sure you give your user permissions to use
kvm:

    $ sudo adduser $USER kvm

and log-out and log-in again.