auplink: 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:

/sbin/auplink - from package: aufs-tools

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

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