Troubleshooting Guide : EXPKEYSIG or NO_PUBKEY error message

On Debian systems, you may get an error message when installing, updating or upgradingCentreon on Debian System

Symptoms :

A message containing the error message NO_PUBKEY is displayed when you try to install, upgrade or update your Centreon on Debian


Solution :

The 11/04/2024, the gpg key for apt repository expired and changed, you should change it by following those two simple steps :


1. Remove the old key:

apt-key del 1441882BED29D70CF2E874D65E9C374559B6C02E

2. Import the new key:

wget -O- | gpg --dearmor | tee /etc/apt/trusted.gpg.d/centreon.gpg > /dev/null 2>&1
apt update


Need to check ? 


To get detailed info about the new key and check that it is correctly installed, run the following command:

apt-key list "C903 FA90 C5EC 3C69 C922 9203 0395 7625 73E5 0BC4"

The results should look like this:

pub ed25519 2024-04-11 [SC]
C903 FA90 C5EC 3C69 C922 9203 0395 7625 73E5 0BC4
uid [unknown] Centreon APT <>
sub cv25519 2024-04-11 [E]


You can find more details about this procedure into our documentation :

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