multinode_server: command not found

Have You tried accessing the binary with the full path?

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/multinode_server - from package: morse-simulator

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