lavapdu-listen: 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/sbin/lavapdu-listen - from package: lavapdu-daemon

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

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