我正在尝试根据其网站（https://istio.io/docs/setup/getting-started/#download）上提供的默认文档来安装Istio，但是尝试这样做时，我遇到了.pem文件的权限被拒绝错误：< / p>
(base) (username)@ubuntu:~/istio-1.6.0$ istioctl install
This will install the default Istio profile into the cluster. Proceed? (y/N) y
Error: failed to apply manifests: invalid configuration: unable to read certificate-authority /home/(username)/.bluemix/plugins/container-service/clusters/mycluster-br39j0bd02hrl9bffbtg/ca-hou02-mycluster.pem for mycluster/br39j0bd02hrl9bffbtg due to open /home/(username)/.bluemix/plugins/container-service/clusters/mycluster-br39j0bd02hrl9bffbtg/ca-hou02-mycluster.pem: permission denied
关于如何解决此错误的任何想法？