I can't connect from my machine to any GKE cluster. From remote machine, it's working, but not from mine and I can't figure out why. If some of you have any idea...

I have installed kubectl from within gcloud (gcloud components install kubectl)

I'm running gcloud init, then on existing cluster or on newly created one with gcloud container clusters create my-cluster --preemptible --cluster-version 1.12.7-gke.10 --machine-type n1-standard-1 --disk-size 20 --num-nodes 1

I'm retrieving my credentials with gcloud container clusters get-credentials my-cluster --zone europe-west1-b --project my-project-123456 which creates a new context for my kubectl. Switching to it (with kubectx).

But when I'm trying to contact my cluster (e.g. kubectl get pods) it fails with with the following message:

Unable to connect to the server: x509: certificate signed by unknown authority

I just can't figure out why my local kubectl can't validate Google CA. I followed all resources I found, tried with other clusters, in other zone/region, with a different version of python (2.7 & 3.6), re-init gcloud, used another Google account, another version of kubectl (1.11, 1.12 & 1.14), update my CA (sudo update-ca-certificates) in Linux (Mint 19.1 Tessa).

Has anyone already face this and found a solution?