acpitool: 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/acpitool - from package: acpitool

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

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