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Install minikube was finished, everything was working fine. Next day command minikube start --vm-driver kvm2 return error:

Starting local Kubernetes v1.10.0 cluster...
Starting VM...
E0826 21:48:31.660132    8562 start.go:174] Error starting host: Error starting stopped host: Error creating  Message='Requested operation is not valid: network 'minikube-net' is not active').

 Retrying.
E0826 21:48:31.660261    8562 start.go:180] Error starting host:  Error starting stopped host: Error creating VM: virError(Code=55, Domain=19, Message='Requested operation is not valid: network 'minikube-net' is not active')

Problem: Libvirt was not activated after restart. Simple workaround :

sudo virsh net-start minikube-net && sudo virsh net-autostart minikube-net