I tried customizing by using different customization tools and by removing different packages at different trials, but none of it worked properly!
The tools that I tried are
What I want to do is to remove all packages given by Ubuntu and make a clean ISO image and what I tried is removed some packages like
libreoffice related packages,
firefox and then I generated an ISO image.
After that I installed it in Virtual-Machine but, it's not installing properly (sometimes saying installer crashed when
libreOffice packages removed, sometimes blank-screen is appearing when any other packages removed, sometimes not even generating ISO).
is there any need of modifying some predefined files after removing/deleting some packages?
How can I create/generate that clean ISO image by removing all unwanted packages provided by Ubuntu?