k3bsetup: 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 Debian possible default full paths are:

/usr/bin/k3bsetup - from package: k3b

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

Error in other languages:
k3bsetup: bevel nie gevind nie
k3bsetup: comandă negăsită
k3bsetup: comando não encontrado
k3bsetup: commande introuvable
k3bsetup: command not found
k3bsetup: käsku ei ole
k3bsetup: không tìm thấy lệnh
k3bsetup: komanda nerasta
k3bsetup: Kommando nicht gefunden.
k3bsetup: kommandot finns inte
k3bsetup: komut yok
k3bsetup: nie znaleziono polecenia
k3bsetup: níor aimsíodh an t-ordú
k3bsetup: no se encontró la orden
k3bsetup: no s'ha trobat l'ordre
k3bsetup: opdracht niet gevonden
k3bsetup: parancs nem található
k3bsetup: perintah tidak ditemukan
k3bsetup: príkaz nenájdený
k3bsetup: příkaz nenalezen
k3bsetup: команда не найдена
k3bsetup: командата не е открита
k3bsetup: 命令找不到
k3bsetup: コマンドが見つかりません