jigdo-mirror: 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/jigdo-mirror - from package: jigdo-file

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

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