I am creating a custom live CD based on Ubuntu 15.10. When the user sees the first boot screen (and doesn't press a key), it will automatically boot into a GUI menu where the user can choose 'Try Ubuntu' or 'Install Ubuntu':
However, if the user presses a key, it gets a text menu. Selecting 'Try Ubuntu' boots directly into the desired live CD:
I can successfully remove the installer boot entries in the text menu (
isolinux/txt.cfg), but this doesn't change the default boot option when the user does not press any key. Removing the installation package
ubiquity is not an option, I just want to prevent the user from starting the installer directly.
How can I change the default boot option to boot into 'Try Ubuntu'?