uufilter: 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 CentOS possible default full paths are:

/usr/bin/uufilter - from package: xloadimage

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/uufilter - from package: xloadimage

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

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