安裝 Caddy 發生 ca-certificates 錯誤解決方式

按照「Ubuntu 安裝 web server Caddy 2」遇到的安裝問題：

echo "deb [trusted=yes] https://apt.fury.io/caddy/ /" \ | sudo tee -a /etc/apt/sources.list.d/caddy-fury.list
sudo apt update

執行第二行 update 後會跳出錯誤訊息：

"Certificate verification failed: The certificate is NOT trusted. The certificate issuer is unknown. Could not handshake: Error in the certificate verification. [IP: XX.XXX.XX.XXX XXX] Reading package lists... Done W: https://apt.fury.io/caddy/InRelease: No system certificates available. Try installing ca-certificates.

代表需要先安裝 ca-certificates

sudo apt install ca-certificates

安裝後重新再一次指令 sudo apt update ，就不會出現錯誤了。

參考資料：
https://caddy.community/t/solved-failed-to-install-caddy-with-official-auto-installation-command/9877