Hi @korandji 

What is the output of the

apt update

 command?

Réception de :1 http://security.debian.org/debian-security bullseye-security InRelease e48,4 kB]
Atteint :2 http://deb.debian.org/debian bullseye InRelease
Réception de :3 https://apt.centreon.com/repository/22.10 bullseye InRelease e1 478 B]
Réception de :4 http://deb.debian.org/debian bullseye-updates InRelease n44,1 kB]
Réception de :5 http://security.debian.org/debian-security bullseye-security/main Sources i192 kB]
Réception de :6 http://security.debian.org/debian-security bullseye-security/main amd64 Packages d236 kB]
Réception de :7 https://apt.centreon.com/repository/22.10 bullseye/main all Packages n138 kB]
Réception de :8 https://packages.sury.org/php bullseye InRelease l6 841 B]
Réception de :9 https://packages.sury.org/php bullseye/main amd64 Packages /376 kB]
Réception de :10 https://apt.centreon.com/repository/22.10 bullseye/main amd64 Packages y1 169 kB]
 

I found solution .

nano /etc/apt/sources.list.d/centreon.list

add line : deb https://apt.centreon.com/repository/22.10-plugin-packs/ bullseye main

then apt update.

Works fine !

Ok, I get it! Sorry, you won’t find the exact same plugin on Debian. But the good news is you won’t need it: the standard NRPE plugin will work perfectly.

To install it:

apt install nagios-nrpe-plugin

And then you will find it here:

/usr/lib/nagios/plugins/check_nrpe

it will work exactly the same as the one you’re looking for.