Ubuiquity customisation

Yes...

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HARD WAY #1
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Uninstall Ubiquity and install a different installer such as Calamares (used by KDE Neon) or the Elementary installer (used by Elementary OS and Pop!_OS).

References:
    https://calamares.io/
    https://jriddell.org/2017/01/20/kde-neon-inaugurated-with-calamares-installer/
    https://github.com/elementary/installer

I haven't used these installers myself, but I don't think they have a minimal install option at all.

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HARD WAY #2
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Modify Ubiquity to not have a minimal install option.
The files are located in /usr/lib/ubiquity/ubiquity/.

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EASY WAY
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Remove `<My Cubic Project>/custom-disk/casper/filesystem.manifest-remove`

If you have an existing project, simply remove this file before starting Cubic.

You can also remove this file wile you are still on Cubic's Terminal page.

Just open up Nautilus or other file browser, navigate to `<My Cubic Project>/custom-disk/casper/`, and delete `filesystem.manifest-remove`.

In Cubic, when you get to the Packages page, you will only see one column allowing you to select packages to be removed after a typical install. The column allowing you to select packages to be removed after a minimal install will not longer be displayed.

When you install your customized OS, the Ubiquity installer should also not present you will an option for a Minimal install.

Thank's a lot for your answer !

I've just one question, if I use the second method, do I need to "update" ubiquity with a command or something like that ?

Edit :

I checked files in /usr/lib/ubiquity/ubiquity, it seems to be a lot a work for a little thing like that, I will use the easy way, thanks !