How to remove the “installed manually” flag and revert to “automatically installed” with apt-get?

Aptitude can help you when you initially install the package:

aptitude install "zlib1g-dev&M"

Or, after your have installed the package:

aptitude markauto "zlib1g"

Edit: If you do not have aptitude, you can use

apt-mark auto zlib1g-dev

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)