copy_db: 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/lib/staden/bin/copy_db - from package: staden

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

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