dscextract: 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/dscextract - from package: devscripts

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

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