unber: 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/unber - from package: asn1c

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

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