debpatch: 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/debpatch - from package: debdelta

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

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