marble-mobile: 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-mobile - from package: marble-mobile

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

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