dumpasn1: 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/dumpasn1 - from package: dumpasn1

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

Error in other languages:
dumpasn1: bevel nie gevind nie
dumpasn1: comandă negăsită
dumpasn1: comando não encontrado
dumpasn1: commande introuvable
dumpasn1: command not found
dumpasn1: käsku ei ole
dumpasn1: không tìm thấy lệnh
dumpasn1: komanda nerasta
dumpasn1: Kommando nicht gefunden.
dumpasn1: kommandot finns inte
dumpasn1: komut yok
dumpasn1: nie znaleziono polecenia
dumpasn1: níor aimsíodh an t-ordú
dumpasn1: no se encontró la orden
dumpasn1: no s'ha trobat l'ordre
dumpasn1: opdracht niet gevonden
dumpasn1: parancs nem található
dumpasn1: perintah tidak ditemukan
dumpasn1: príkaz nenájdený
dumpasn1: příkaz nenalezen
dumpasn1: команда не найдена
dumpasn1: командата не е открита
dumpasn1: 命令找不到
dumpasn1: コマンドが見つかりません