copyright-update: 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/copyright-update - from package: copyright-update

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

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