kbugbuster: 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/kbugbuster - from package: kdesdk

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

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