van-pydeb: 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/van-pydeb - from package: python-van.pydeb

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

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