How to boot in Installtation instead Try mode?

Dear Lubuntu Team
I am trying to customize Lubuntu 22.04 and I have a problem - I want to be automatically taken to installation when booting from a disk image, without the opportunity to try, but haven’t found any solution yet. Is it possible to do this and how it could be done? Thanks for response.

Have you looked at any code?

eg. Ubuntu – Details of package lubuntu-installer-prompt in oracular should show how the question of live or install occurs on our current ISOs; and it’s README maybe where I’d start looking for clues as how modern Lubuntu ISOs start operation.