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According to the dpkg man page, a selection state of install means "The package is selected for installation". A selection state of deinstall means "The package is selected for deinstallation (i.e. we want to remove all files, except configuration files)".

What confuses me, and what I would like to clarify: After I remove a package, it is in the selection state deinstall. But it's already removed. How can something that is removed be in any state? And I did remove all files, I don't "want to remove" them.

Same for the install selection state: How can a package be "selected for installation" if it is already installed?

In the same vein, the man page of dpkg-query differentiates between desired action and package status, which I understand to be the same as selection state and state, respectively. Most packages have a desired action of Install and a status of Installed. Again, what is this supposed to mean? Why do we desire installing a package that is already installed?

And the big question: Under which circumstances is this distinction between selection/desired state and normal state relevant at all?

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"selection state" tells dpkg what you WANT.

"selection status" tells dpkg whether a package is REALLY installed or not.

How can a package be "selected for installation" if it is already installed? is a (understandable) misunderstanding of the language. It does not mean in the future -- dpkg has no concept of future or past.

In most cases, your preference and the system status will match. That's a good thing. It means that your system is working properly:

       State                                      Status
I want Package X to be installed     --and-- Package X is installed.
I want Package Y to be NOT installed --and-- Package Y is NOT installed.

A discrepancy...

       State                                      Status
I want Package X to be NOT installed --but-- Package X is installed

...should be investigated. It sometimes indicates problems (conflicting packages, corrupt packages) if the same discrepancy persists. dpkg is not designed to solve discrepancies for you...but apt is.

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