Already install minicube and kubctl

kubectl cluster-info
Kubernetes master is running at http://localhost:8080

To further debug and diagnose cluster problems, use ‘kubectl cluster-info dump’.
The connection to the server was refused - did you specify the right host or port?
Command ‘Kubernetes’ not found, did you mean:
command ‘kubernetes’ from deb kubernetes (1.0)
Try: sudo apt install
this error appear what is the solution