nnrpd-ssl: 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-ssl - from package: inn2

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

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