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# Grafana Repository Issue (2025 Version)

### What’s Going On?


* The repository’s key (fingerprint `B53AE77BADB630A683046005963FA27710458545`) expired on **2025‑08‑23**.
* This expired key causes the InRelease file signature to be invalid, resulting in the `EXPKEYSIG` error you're seeing.
* This isn't a local issue—Grafana's key on their servers needs a replacement - [https://apt.grafana.com/](https://apt.grafana.com/).

Grafana has already rotated and extended the key, so you just need to refresh it on your system:

```
# Remove old expired Grafana key (if present)
sudo apt-key del B53AE77BADB630A683046005963FA27710458545 2>/dev/null || true
sudo apt-key del 4E40DDF6D76E284A4A6780E48C8C34C524098CB6 2>/dev/null || true
sudo apt-key del 0E22EB88E39E12277A7760AE9E439B102CF3C0C6 2>/dev/null || true
# Create keyring directory
sudo mkdir -p /etc/apt/keyrings/
# Download and install the refreshed Grafana key
wget -q -O - [https://apt.grafana.com/gpg.key](https://apt.grafana.com/gpg.key) | gpg --dearmor | sudo tee /etc/apt/keyrings/grafana.gpg > /dev/null
# Update Grafana repo definition to use new keyring
echo "deb [signed-by=/etc/apt/keyrings/grafana.gpg] [https://apt.grafana.com](https://apt.grafana.com) stable main" | sudo tee /etc/apt/sources.list.d/grafana.list
# Refresh package lists
sudo apt-get update
# Upgrade Grafana (and other packages if available)
sudo apt-get upgrade
```

This will:

* Clean out any **old/expired keys**.
* Import the **new extended key**.
* Ensure your Grafana repo uses `/etc/apt/keyrings/grafana.gpg` going forward.

---

### ✅ Why This Works

* The error was caused because your system still had the **old Grafana key** cached, which expired on **2025-08-23**.
* On **2025-08-22**, Grafana extended the new key (`B53AE77BADB630A683046005963FA27710458545`) for two more years.
* By re-importing it, you’re telling `apt` to trust the updated key, and the signature verification will pass again.

---