acr-install: 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/acr-install - from package: acr

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

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