This article is not a tutorial but only a little talk about my experiment. However, I hope beginner user can benefit from this as we will see how APT command lines and how Ubuntu repositories being used in real life. We can also adapt this experiment into other distro such as Debian or PureOS. As usual, I prepare screenshots to make explanations clearer. Enjoy learning!

(Process of installing a package from eoan (newer) into disco (older) Ubuntu system)

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