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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Line Number in the mode line shows ??.
Date: Sun, 16 May 2021 07:27:01 +0300
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 (message from Christopher Dimech on Sun, 16 May 2021 06:05:57 +0200)
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> From: Christopher Dimech <dimech@gmx.com>
> Date: Sun, 16 May 2021 06:05:57 +0200
> Sensitivity: Normal
> Cc: help-gnu-emacs@gnu.org
> 
> > > After writing many lines in a file, the Line Number in the mode line
> > > shows ??.
> > 
> > Look for "Optional Mode Line Features" in the Emacs manual.
>  
> How would that help?  Looks as a bug to me.

Because it isn't a bug, it's a feature, and the section pointed out by
Óscar explains how it works and how to control it.