我想在已使用virtualbox Ubuntu 18.04 虚拟机的本地计算机上尝试kuberntetes，在此vm中，我正在运行我的所有cmds，在那里我要建立所有的kuberentes本地环境：
我已经安装：
但是我在跑步时：sudo minikube start --vm-driver=none
我没有给出此输出：
? minikube v1.11.0 sur Ubuntu 18.04
✨ Utilisation du pilote none basé sur le profil existant
? Démarrage du noeud de plan de contrôle minikube dans le cluster minikube
? Restarting existing none bare metal machine for "minikube" ...
ℹ️ OS release is Ubuntu 18.04.4 LTS
? Préparation de Kubernetes v1.18.3 sur Docker 19.03.11...
▪ kubelet.resolv-conf=/run/systemd/resolve/resolv.conf
? Failed to update cluster: updating node: downloading binaries: downloading kubectl: download failed: https://storage.googleapis.com/kubernetes-release/release/v1.18.3/bin/linux/amd64/kubectl?checksum=file:https://storage.googleapis.com/kubernetes-release/release/v1.18.3/bin/linux/amd64/kubectl.sha256: getter: &{Ctx:context.Background Src:https://storage.googleapis.com/kubernetes-release/release/v1.18.3/bin/linux/amd64/kubectl?checksum=file:https://storage.googleapis.com/kubernetes-release/release/v1.18.3/bin/linux/amd64/kubectl.sha256 Dst:/home/srcd/.minikube/cache/linux/v1.18.3/kubectl.download Pwd: Mode:2 Detectors:[0x2b3cb38 0x2b3cb38 0x2b3cb38 0x2b3cb38 0x2b3cb38 0x2b3cb38] Decompressors:map[bz2:0x2b3cb38 gz:0x2b3cb38 tar.bz2:0x2b3cb38 tar.gz:0x2b3cb38 tar.xz:0x2b3cb38 tbz2:0x2b3cb38 tgz:0x2b3cb38 txz:0x2b3cb38 xz:0x2b3cb38 zip:0x2b3cb38] Getters:map[file:0xc000c1a970 http:0xc000c22800 https:0xc000c22820] Dir:false ProgressListener:0x2b152d0 Options:[0xc1f6a0]}: invalid checksum: Error downloading checksum file: Get https://storage.googleapis.com/kubernetes-release/release/v1.18.3/bin/linux/amd64/kubectl.sha256: x509: certificate signed by unknown authority
? minikube is exiting due to an error. If the above message is not useful, open an issue:
? https://github.com/kubernetes/minikube/issues/new/choose
似乎是一个证书问题（x509: certificate signed by unknown authority）
解决方法？