marble: 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/marble - from package: marble

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

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