virt-manager complains about missing KVM

[Tommi Höynälänmaa]

virt-manager gives the following warning when I start to create a 
virtual machine:

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Warning: KVM is not available. This may mean the KVM package is not 
installed, or the KVM kernel modules are not loaded. Your virtual 
machines may perform poorly.

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I have installed package qemu-kvm and lsmod shows that kvm kernel module 
is loaded. I'm using Debian stable. What is wrong?

     - Tommi Höynälänmaa