To add to the other comment, package managers keep a local copy of the list of available packages and the version. When you do a pacman -S xxx the package manager looks up xxx in the cache and downloads the package from whatever mirror youre using as well as any dependencies, looking them up in the same way from your cache. This works for a while even if theres a new update available because mirrors usually keep a few previous versions.

Once you do a pacman -Sy you update your cache to the latest one. If you then update xxx, it will update xxx and pull in any dependency updates required, but any other packages that depended on the same packages dont get updated, leaving you in a partially upgraded state.

Why is mint even recommended to new users at this point. Cinnamon is nowhere near Gnome or Plasma and both of these provide much simpler and more unified experience in things like settings

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