aesfix: 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/aesfix - from package: aesfix

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

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