eureka: 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/eureka - from package: eureka

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

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