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

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

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