acpinames: 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/acpinames - from package: acpica-tools

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

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