dpatch: 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/dpatch - from package: dpatch

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

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