rsurface2kdt: 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/rsurface2kdt - from package: gerris-mpi
/usr/bin/rsurface2kdt - from package: gerris

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

Error in other languages:
rsurface2kdt: bevel nie gevind nie
rsurface2kdt: comandă negăsită
rsurface2kdt: comando não encontrado
rsurface2kdt: commande introuvable
rsurface2kdt: command not found
rsurface2kdt: käsku ei ole
rsurface2kdt: không tìm thấy lệnh
rsurface2kdt: komanda nerasta
rsurface2kdt: Kommando nicht gefunden.
rsurface2kdt: kommandot finns inte
rsurface2kdt: komut yok
rsurface2kdt: nie znaleziono polecenia
rsurface2kdt: níor aimsíodh an t-ordú
rsurface2kdt: no se encontró la orden
rsurface2kdt: no s'ha trobat l'ordre
rsurface2kdt: opdracht niet gevonden
rsurface2kdt: parancs nem található
rsurface2kdt: perintah tidak ditemukan
rsurface2kdt: príkaz nenájdený
rsurface2kdt: příkaz nenalezen
rsurface2kdt: команда не найдена
rsurface2kdt: командата не е открита
rsurface2kdt: 命令找不到
rsurface2kdt: コマンドが見つかりません