mdbus2: 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/mdbus2 - from package: mdbus2

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

Error in other languages:
mdbus2: bevel nie gevind nie
mdbus2: comandă negăsită
mdbus2: comando não encontrado
mdbus2: commande introuvable
mdbus2: command not found
mdbus2: käsku ei ole
mdbus2: không tìm thấy lệnh
mdbus2: komanda nerasta
mdbus2: Kommando nicht gefunden.
mdbus2: kommandot finns inte
mdbus2: komut yok
mdbus2: nie znaleziono polecenia
mdbus2: níor aimsíodh an t-ordú
mdbus2: no se encontró la orden
mdbus2: no s'ha trobat l'ordre
mdbus2: opdracht niet gevonden
mdbus2: parancs nem található
mdbus2: perintah tidak ditemukan
mdbus2: príkaz nenájdený
mdbus2: příkaz nenalezen
mdbus2: команда не найдена
mdbus2: командата не е открита
mdbus2: 命令找不到
mdbus2: コマンドが見つかりません