[zh-cn] Update install-kubeadm.md

Signed-off-by: Gao Qian <gaoq.jy@fujitsu.com>

content/zh-cn/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md

@@ -282,7 +282,7 @@ For more information on version skews, see:
 2. 下载 Google Cloud 公开签名秘钥：
 
    ```shell
-   sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
+   sudo curl -fsSLo /etc/apt/keyrings/kubernetes-archive-keyring.gpg https://packages.cloud.google.com/apt/doc/apt-key.gpg
    ```
 
 <!--
@@ -291,7 +291,7 @@ For more information on version skews, see:
 3. 添加 Kubernetes `apt` 仓库：
 
    ```shell
-   echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
+   echo "deb [signed-by=/etc/apt/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
    ```
 
 <!--
@@ -304,6 +304,14 @@ For more information on version skews, see:
    sudo apt-get install -y kubelet kubeadm kubectl
    sudo apt-mark hold kubelet kubeadm kubectl
    ```
+{{< note >}}
+<!--
+In releases older than Debian 12 and Ubuntu 22.04, `/etc/apt/keyrings` does not exist by default.
+You can create this directory if you need to, making it world-readable but writeable only by admins.
+-->
+在低于 Debian 12 和 Ubuntu 22.04 的发行版本中，`/etc/apt/keyrings` 默认不存在。
+如有需要，你可以创建此目录，并将其设置为对所有人可读，但仅对管理员可写。
+{{< /note >}}
 
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