diff --git a/README.md b/README.md
index 61fc46e..703647b 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,14 @@
 
 ```sh
 curl -s -L https://sh.osa.cubetiqs.com/apt-mirror.sh | sudo bash
+```
+
+### Fix APT Public Key
+```text
+The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8
+```
+
+```shell
+sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7EA0A9C3F273FCD8
+sudo apt update
 ```
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