acpi_fakekey: 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/acpi_fakekey - from package: acpi-fakekey

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

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