mdbrebase: 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/mdbrebase - from package: mono-devel

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

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