udpbso: command not found

Have You tried accessing the binary with the full path?

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/udpbso - from package: ion

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