bus: 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/sbin/bus - from package: atm-tools

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

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