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It seems to me that Ubuntu has to main categories of packages.

There are the officially Ubuntu packages supported and maintained by Canonical itself: Ubuntu Core. And there are the freetime maintained community packages in "universe".

Am I right so far?

How is it decided if a package goes to universe or core?

buhtz
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    I doubt that any one here can answer that. This site is manned by volunteers and no one works for the company. – David Sep 28 '22 at 09:47
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    The duplicate I think matches your question (or an answer did in my opinion; see start answer by muru), but you can see https://help.ubuntu.com/community/Repositories/Ubuntu I'm involved with a few Ubuntu teams, and not all comes from Debian (Debian is preferred, but if Debian is too old or freezes get in the way; going direct upstream allows for newer packages), detail that could be missed in the answer I felt applied. – guiverc Sep 28 '22 at 10:07
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    Background reading: The relationship between Canonical and Ubuntu: https://ubuntu.com/community/canonical – user535733 Sep 28 '22 at 11:15
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    Background reading: The four primary Ubuntu repositories: https://askubuntu.com/questions/58364/whats-the-difference-between-multiverse-universe-restricted-and-main – user535733 Sep 28 '22 at 11:16
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    Wrong terms: "core" refers to Ubuntu Core, a snap-only flavor of Ubuntu. You probably meant the "Main" deb repository. – user535733 Sep 28 '22 at 11:18

1 Answers1

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The decision process is simple:

  • If the software is required for the install process (like parted)
  • Or will be one of the final applications on the stock installed system (like network-manager or libreoffice)
  • Or one of their dependencies (like openssl)

...then it goes into Main.

All other open source software with a compatible license goes into Universe.

In other words, when you install Ubuntu and first reboot into the newly-installed system (no customization), 100% of your installed packages are in Main...and very little else is in Main.

user535733
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