dcontrol: 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/dcontrol - from package: devscripts

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

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