ltpadmin: 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/ltpadmin - from package: ion

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

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