upse123: 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/upse123 - from package: upse123

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

Error in other languages:
upse123: bevel nie gevind nie
upse123: comandă negăsită
upse123: comando não encontrado
upse123: commande introuvable
upse123: command not found
upse123: käsku ei ole
upse123: không tìm thấy lệnh
upse123: komanda nerasta
upse123: Kommando nicht gefunden.
upse123: kommandot finns inte
upse123: komut yok
upse123: nie znaleziono polecenia
upse123: níor aimsíodh an t-ordú
upse123: no se encontró la orden
upse123: no s'ha trobat l'ordre
upse123: opdracht niet gevonden
upse123: parancs nem található
upse123: perintah tidak ditemukan
upse123: príkaz nenájdený
upse123: příkaz nenalezen
upse123: команда не найдена
upse123: командата не е открита
upse123: 命令找不到
upse123: コマンドが見つかりません