aesubunit: 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/aesubunit - from package: aegis

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

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