Merge pull request #44680 from fbauzac/patch-1

install-kubectl-linux.md: add chmods

Author: k8s-ci-robot

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

@@ -139,6 +139,7 @@ The following methods exist for installing kubectl on Linux:
    # If the folder `/etc/apt/keyrings` does not exist, it should be created before the curl command, read the note below.
    # sudo mkdir -p -m 755 /etc/apt/keyrings
    curl -fsSL https://pkgs.k8s.io/core:/stable:/{{< param "version" >}}/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
+   sudo chmod 644 /etc/apt/keyrings/kubernetes-apt-keyring.gpg # allow unprivileged APT programs to read this keyring
    ```
 
 {{< note >}}
@@ -151,6 +152,7 @@ In releases older than Debian 12 and Ubuntu 22.04, folder `/etc/apt/keyrings` do
    ```shell
    # This overwrites any existing configuration in /etc/apt/sources.list.d/kubernetes.list
    echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/{{< param "version" >}}/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
+   sudo chmod 644 /etc/apt/sources.list.d/kubernetes.list   # helps tools such as command-not-found to work correctly
    ```
 
 {{< note >}}