mirrortool: 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/mirrortool - from package: omt

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

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