dtn2adminep: 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/dtn2adminep - from package: ion

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

Error in other languages:
dtn2adminep: bevel nie gevind nie
dtn2adminep: comandă negăsită
dtn2adminep: comando não encontrado
dtn2adminep: commande introuvable
dtn2adminep: command not found
dtn2adminep: käsku ei ole
dtn2adminep: không tìm thấy lệnh
dtn2adminep: komanda nerasta
dtn2adminep: Kommando nicht gefunden.
dtn2adminep: kommandot finns inte
dtn2adminep: komut yok
dtn2adminep: nie znaleziono polecenia
dtn2adminep: níor aimsíodh an t-ordú
dtn2adminep: no se encontró la orden
dtn2adminep: no s'ha trobat l'ordre
dtn2adminep: opdracht niet gevonden
dtn2adminep: parancs nem található
dtn2adminep: perintah tidak ditemukan
dtn2adminep: príkaz nenájdený
dtn2adminep: příkaz nenalezen
dtn2adminep: команда не найдена
dtn2adminep: командата не е открита
dtn2adminep: 命令找不到
dtn2adminep: コマンドが見つかりません