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I'm trying to update my packages so that I can upgrade from 18.04 to 20.04 Xubuntu via terminal.

This will install available updates for all available packages including Firefox, ones which I installed later on like opera browser, etc. This is unwanted for me.

How can I just update the core system packages alone and fast forward to upgrading my system? In other words, how to make these app updates independent from system updates?

  • Why would you want that? Packages have dependencies and trying to hold back packages is risky and may end breaking up the system. – To Do Jun 22 at 18:41
  • @ToDo Some of the apps include installations via .deb files which could make up a huge download size. Aren't these packages supposed to work standalone? I'm not sure. I use Windows mostly, and this model of OS update seems daunting to me, when I'm now at home on a limited data plan. How come Windows update does not cause dependency issues as there are shared dlls in system32 folder? – Vaisak Mohan Jun 24 at 17:23
  • even if you install package by downloading in .deb format it stills have dependencies. remember when you don't have dependencies that packed .deb software also install what it need – Sudip Ghimire Jun 25 at 2:10
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copy the file from /etc/apt/sources.list and /etc/apt/sources.list.d/ in that text file remove everything but not with domain ubuntu.com. And please dont forget to backup these text file because you need it later. Now run

sudo apt-get update && sudo apt-get dist-upgrade

after update complete keep the orginal content files and its content where it was before and run

sudo apt-get update

This is what you should do. But as a reminder you should have better update all packages until you are doing something strict

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The Debian model of software packages makes what you want very difficult (impossible in some circumstances, trivial in others). The concept of a "core system" is not defined in Debian. All software, whether you consider it core or non-core, uses the same package system, the same dependencies, and the same uniform versions.

That 'same versions' requirement is often the stopper for using wrong-version packages.

  • Warning: When you try to bypass package version requirements, you may break your system.

The concept of a "core system" IS defined in a Snap-based system like Ubuntu Core, and updates of core- and non-core snaps are unrelated...but the idea of withholding upgrades is rather anathema to Snap-based systems.

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