Netbeans nao instala

[Leobons]

Apesar de jah ter instalado a JDK e reiniciado o terminal, ainda continuo recebendo a mensagem:
Java SE Development Kit (JDK) was not found on this computer
JDK 6 is required for installing the NetBeans IDE. Make sure that the JDK is properly installed and run installer again.
You can specify valid JDK location using --javahome installer argument.

rodo o sh do netbeans e nao consigo instalar. Alguem sabe oque pode estar havendo de errado?