Well if you softmodded...then that probably means you forgot to add a dashboard. If you can, get back into your linux installer, reinstall the softmod and then install evox or unleashx. If the installer doesntwork, then your best bet would be to download AID2.11, burn it to dvd (make sure you add the dummy file to it) and then put it in your xbox and cold boot. Then you should have an installer menu just like your linux installer.
