Public bug reported:

When a package is not installed and apt dist-upgrade offers to install
it, if this is not desired, it is possible to hold the package using
multiple tools, which puts it in a state documented in dpkg.1 as:

       hold
           A package marked to be on hold is kept on the same version, that
           is, no automatic new installs, upgrades or removals will be
           performed on them, unless these actions are requested explicitly,
           or are permitted to be done automatically with the --force-hold
           option.

Note the "no automatic new installs", suggesting that this is a correct
and valid use for packages that are not installed. I use "apt-mark hold"
to put packages in this state.

This is respected by apt when choosing what to install, but any
installation causes this state to be lost for uninstalled packages, even
installations of completely unrelated packages.

Steps to reproduce:

- Add a repository to sources.list that adds new essential packages, and run 
`apt update`.
- Observe that `apt dist-upgrade` will want to install new packages.
- Put the packages on hold, using `apt-mark hold <package>`.
- Observe that `apt dist-upgrade` will no longer want to install new packages.
- Install an unrelated package.
- Observe that `apt dist-upgrade` will again want to install new packages.

Seen on Ubuntu 20.10, apt 2.1.10.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1904195

Title:
  apt cancels holds on uninstalled packages

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