dumpleases: 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/dumpleases - from package: udhcpd

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

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