calypso: 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/calypso - from package: calypso

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

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