fatpack: 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/fatpack - from package: libapp-fatpacker-perl

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

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