nnrpd: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/lib/news/bin/nnrpd - from package: inn2

You may install the required package with command apt-get install {package}

Error in other languages:
nnrpd: bevel nie gevind nie
nnrpd: comandă negăsită
nnrpd: comando não encontrado
nnrpd: commande introuvable
nnrpd: command not found
nnrpd: käsku ei ole
nnrpd: không tìm thấy lệnh
nnrpd: komanda nerasta
nnrpd: Kommando nicht gefunden.
nnrpd: kommandot finns inte
nnrpd: komut yok
nnrpd: nie znaleziono polecenia
nnrpd: níor aimsíodh an t-ordú
nnrpd: no se encontró la orden
nnrpd: no s'ha trobat l'ordre
nnrpd: opdracht niet gevonden
nnrpd: parancs nem található
nnrpd: perintah tidak ditemukan
nnrpd: príkaz nenájdený
nnrpd: příkaz nenalezen
nnrpd: команда не найдена
nnrpd: командата не е открита
nnrpd: 命令找不到
nnrpd: コマンドが見つかりません