dump2vtk: 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/dump2vtk - from package: esys-particle

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

Error in other languages:
dump2vtk: bevel nie gevind nie
dump2vtk: comandă negăsită
dump2vtk: comando não encontrado
dump2vtk: commande introuvable
dump2vtk: command not found
dump2vtk: käsku ei ole
dump2vtk: không tìm thấy lệnh
dump2vtk: komanda nerasta
dump2vtk: Kommando nicht gefunden.
dump2vtk: kommandot finns inte
dump2vtk: komut yok
dump2vtk: nie znaleziono polecenia
dump2vtk: níor aimsíodh an t-ordú
dump2vtk: no se encontró la orden
dump2vtk: no s'ha trobat l'ordre
dump2vtk: opdracht niet gevonden
dump2vtk: parancs nem található
dump2vtk: perintah tidak ditemukan
dump2vtk: príkaz nenájdený
dump2vtk: příkaz nenalezen
dump2vtk: команда не найдена
dump2vtk: командата не е открита
dump2vtk: 命令找不到
dump2vtk: コマンドが見つかりません