Editing Dev/APT

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APT by default considers only signing keys in:

* file <code>/etc/apt/trusted.gpg</code>
* folder <code>/etc/apt/trusted.gpg.d/</code>

Signing keys in folder <code>/usr/share/keyrings</code> are ignored by default by APT, unless the <code>signed-by</code> keyword is used in APT sources files (i.e. in configuration file <code>/etc/apt/sources.list</code> or in configuration snippet drop-in folder <code>/etc/apt/sources.list.d</code>).

Example  <code>signed-by</code> keyword use:

<pre>
[signed-by=/usr/share/keyrings/derivative.asc]
</pre>

Example of complete deb line with  <code>signed-by</code> keyword.

<pre>
deb [signed-by=/usr/share/keyrings/derivative.asc] https://deb.kicksecure.com bullseye main contrib non-free
</pre>

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