ovdb_monitor: 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/ovdb_monitor - from package: inn2

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

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