udplso: 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/udplso - from package: ion

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

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