opldecode: 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/opldecode - from package: printer-driver-foo2zjs

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

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