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.