How can I get rid of the message "kvm: disabled by BIOS"?

What worked for me:

1) Turn on the computer and press f2 to see the setup (BIOS) when you see a screen with black background.

2) Go to "Configuration" tab.

3) Select the option "Intel Virtual Technology" and enable it by pressing F5 or F6.

4) Press F10 to save and exit. When a prompt message appears asking you to confirm this action, select yes.

5) Your computer will turn off for 10 seconds. Then, it will boot and load your OS without showing that error.

Create a file called /etc/modprobe.d/blacklist-kvm.conf:
(For example, you can use gedit gksu gedit /etc/modprobe.d/blacklist-kvm.conf or nano sudo nano /etc/modprobe.d/blacklist-kvm.conf)

Put in it the following three lines:

blacklist kvm
blacklist kvm_intel
blacklist kvm_amd

I'm not sure if this will work for you, because I don't have a suitable system also disabled by BIOS. But this is a reasonable way of disabling KVM on Debian or Ubuntu, so you should try and see if it also works to disable your message.

First of all, you might want to see if KVM is loaded in the kernel. To do this, run something like this:

lsmod | grep kvm

If you do get any answer from that, you may want to stop kvm from running. To do that, this will help:

modprobe -r kvm

Remember to follow for any other kvm module. In my case, there is also a kvm_intel module, so I also have to run

modprobe -r kvm_intel

To stop kvm from being enabled at boot time you have to find the file located at /etc/modules and modify it so that KVM doesn't launch at boot time. After you modify your /etc/modules file restart your computer and see if the problem persists.