kpartsaver.kss: 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/kpartsaver.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/kpartsaver.kss - from package: kscreensaver

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

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