Can't remember where I got these instructions but they work for me. I've never got aQemu to do anything so this is all from the terminal.
This creates a flexible disk image: qemu-img create -f qcow2 trisquel.img 100g In the directory where you made your image put your iso and: sudo kvm -m 1024 -cdrom /trisquel_7.0_amd64.iso -boot d trisquel.img To start the image after install do: sudo kvm -m 1024 trisquel.img -m is the amount of memory you want to allocate. 512 is probably enough.
