Synaptic error message

From	Richard Owlett <rowlett@cloud85.net>
Newsgroups	linux.debian.user
Subject	Synaptic error message
Date	2021-06-26 16:30 +0200
Message-ID	<CuhtL-6OE-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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I have a empty machine on which I've done a default install of
Debian 10.7.0 with MATE as my desktop. As I intend later to install some 
non-Debian software I wanted a local repository. To have a known base to 
start from I extracted the contents of dvd1.iso to a local directory.

My sources.list references it as:
> deb [ Trusted=yes ] file:////home/richard/DVDs/dvd1/ buster main contrib  non-free

In Synaptic when I do Edit->Reload Package Information it responds:
> The repository 'file://home/richard/DVDs/dvd1 buster Release' is not signed.


https://html.duckduckgo.com/html?q=%2B%22synaptic%22%20%2B%22repository%22%20%2B%22not%20signed%22%20site%3Adebian.org 
gives no useful information.

What do I do?
What should I have read?
TIA

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Synaptic error message Richard Owlett <rowlett@cloud85.net> - 2021-06-26 16:30 +0200
  Re: Synaptic error message "Andrew M.A. Cater" <amacater@einval.com> - 2021-06-26 17:20 +0200
    Re: Synaptic error message Richard Owlett <rowlett@cloud85.net> - 2021-06-26 17:50 +0200
      Re: Synaptic error message "Andrew M.A. Cater" <amacater@einval.com> - 2021-06-26 18:50 +0200
      Re: Synaptic error message Brian <ad44@cityscape.co.uk> - 2021-06-26 20:20 +0200
        Re: Synaptic error message Andrei POPESCU <andreimpopescu@gmail.com> - 2021-06-26 21:00 +0200
        Re: Synaptic error message Joe <joe@jretrading.com> - 2021-06-27 10:30 +0200
          Re: Synaptic error message rhkramer@gmail.com - 2021-06-27 14:50 +0200
  Re: Synaptic error message Darac Marjal <mailinglist@darac.org.uk> - 2021-06-27 20:00 +0200
    RESOLVED: Synaptic error message Richard Owlett <rowlett@cloud85.net> - 2021-06-27 23:10 +0200
      Re: RESOLVED: Synaptic error message Brian <ad44@cityscape.co.uk> - 2021-06-28 00:40 +0200
        Re: RESOLVED: Synaptic error message Richard Owlett <rowlett@cloud85.net> - 2021-06-28 00:50 +0200

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