euler: 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/euler - from package: euler

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