prompt: 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/prompt - from package: libmodglue1

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