Merge pull request #45814 from lorenzogrv/patch-1

kubectl debian install guide does not mention gnupg at all

Author: k8s-ci-robot

content/en/docs/tasks/tools/install-kubectl-linux.md

@@ -130,7 +130,7 @@ The following methods exist for installing kubectl on Linux:
    ```shell
    sudo apt-get update
    # apt-transport-https may be a dummy package; if so, you can skip that package
-   sudo apt-get install -y apt-transport-https ca-certificates curl
+   sudo apt-get install -y apt-transport-https ca-certificates curl gnupg
    ```
 
 2. Download the public signing key for the Kubernetes package repositories. The same signing key is used for all repositories so you can disregard the version in the URL: