argonaut-quota: 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/sbin/argonaut-quota - from package: argonaut-quota

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

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