apt-get: Why "Unable to find source package" errors?

From	Kynn Jones <kynnjo@gmail.com>
Newsgroups	linux.debian.user
Subject	apt-get: Why "Unable to find source package" errors?
Date	2017-08-21 02:10 +0200
Message-ID	<ugIs1-5pK-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Example:

    % sudo apt-get build-dep emacs25
    Reading package lists... Done
    E: Unable to find a source package for emacs25

I have run `apt-get update` before running the command above, and my
`/etc/apt/sources.list` file contains the following

    deb  http://deb.debian.org/debian stretch main contrib non-free
    deb-src  http://deb.debian.org/debian stretch main contrib non-free

    deb  http://deb.debian.org/debian stretch-updates main contrib non-free
    deb-src  http://deb.debian.org/debian stretch-updates main contrib
non-free

    deb http://security.debian.org/ stretch/updates main contrib non-free
    deb-src http://security.debian.org/ stretch/updates main contrib
non-free

What am I doing wrong?

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apt-get: Why "Unable to find source package" errors? Kynn Jones <kynnjo@gmail.com> - 2017-08-21 02:10 +0200
  Re: apt-get: Why "Unable to find source package" errors? kamaraju kusumanchi <raju.mailinglists@gmail.com> - 2017-08-21 03:00 +0200
    Re: apt-get: Why "Unable to find source package" errors? Kynn Jones <kynnjo@gmail.com> - 2017-08-21 03:20 +0200
      Re: apt-get: Why "Unable to find source package" errors? kamaraju kusumanchi <raju.mailinglists@gmail.com> - 2017-08-21 06:00 +0200
    Re: apt-get: Why "Unable to find source package" errors? Dejan Jocic <jodejka@gmail.com> - 2017-08-21 09:20 +0200
      Re: apt-get: Why "Unable to find source package" errors? Cindy-Sue Causey <butterflybytes@gmail.com> - 2017-08-21 09:50 +0200
        Re: apt-get: Why "Unable to find source package" errors? Kynn Jones <kynnjo@gmail.com> - 2017-08-21 11:10 +0200
          Re: apt-get: Why "Unable to find source package" errors? Dejan Jocic <jodejka@gmail.com> - 2017-08-21 11:20 +0200
            Re: apt-get: Why "Unable to find source package" errors? Kynn Jones <kynnjo@gmail.com> - 2017-08-21 12:10 +0200
            Re: apt-get: Why "Unable to find source package" errors? Kynn Jones <kynnjo@gmail.com> - 2017-08-21 12:10 +0200
            Re: apt-get: Why "Unable to find source package" errors? Curt <curty@free.fr> - 2017-08-21 12:20 +0200
    Re: apt-get: Why "Unable to find source package" errors? Sven Hartge <sven@svenhartge.de> - 2017-08-21 09:30 +0200
  Re: apt-get: Why "Unable to find source package" errors? Jude DaShiell <jdashiel@panix.com> - 2017-08-21 03:40 +0200
  Re: apt-get: Why "Unable to find source package" errors? Darac Marjal <mailinglist@darac.org.uk> - 2017-08-21 12:40 +0200
    Re: apt-get: Why "Unable to find source package" errors? Kynn Jones <kynnjo@gmail.com> - 2017-08-21 23:10 +0200
      Re: apt-get: Why "Unable to find source package" errors? Brian <ad44@cityscape.co.uk> - 2017-08-22 00:10 +0200

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