uupdate: 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/uupdate - from package: devscripts

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

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