cupsfilter: 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/sbin/cupsfilter - from package: cups

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

On Debian possible default full paths are:

/usr/sbin/cupsfilter - from package: cups

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

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