dh_scour: 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/dh_scour - from package: python-scour

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

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