aubrsync: 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/aubrsync - from package: aufs-tools

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

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