I don't think you can. Editing a single file every few years really isn't a big deal. A dedicated GUI app would be nice but I doubt any developer is going to make it unless Debian hit big with desktop home users.
this post was submitted on 03 Jul 2023
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Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian provides more than a pure OS: it comes with over 59000 packages, precompiled software bundled up in a nice format for easy installation on your machine.
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my point is, there is already a GUI app for software updates.... KDE discover. but i wasn't sure if it had the ability to do a full version upgrade.
seems like it would be a simple thing to add... a dialog that says "do you want to upgrade to debian 12/bookworm?" and then it automagically edits your sources.list for you
i guess if it doesn't exist, i could submit a feature request