aster: 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/aster - from package: code-aster-mpi-engine

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

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