aa-unconfined: 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/aa-unconfined - from package: apparmor-utils

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

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