numconv: 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/bin/numconv - from package: numconv

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

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