debdelta: 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/debdelta - from package: debdelta

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

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