libvirtd must be started before you run minikube. Failure to do so will result in the below error 
Failed to connect socket to '/var/run/libvirt/libvirt-sock'
I believe this should be noted in the documentation to assist other users.  
Added lines 40-43

move the systemctl start closer to the install steps 
libvirtd.service

corrected lines 62 to 78 and added sudo to the systemctl command

add some extra ticks on line 24.