keuphoria.kss: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/keuphoria.kss - from package: kdeartwork-screensavers

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

On Debian possible default full paths are:

/usr/bin/keuphoria.kss - from package: kscreensaver

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