ktuberling: 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/ktuberling - from package: kdegames

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

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