se_aptitude: 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/se_aptitude - from package: policycoreutils

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

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