uupoll: 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/sbin/uupoll - from package: uucp

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

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