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APT by default considers only signing keys in:

• file /etc/apt/trusted.gpg
• folder /etc/apt/trusted.gpg.d/

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

Example signed-by keyword use:

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

Example of complete deb line with signed-by keyword.

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

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• signed-by keyword forum discussion

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Kicksecure A secure by default operating system with the latest security research in place. Copy or share this direct link! Click = Copy Copied to clipboard! https://www.kicksecure.com/wiki/Dev%2FAPT?direction=next&oldid=56334 Click below ↴ = Copy to Clipboard Click = Copy Copied to clipboard! [[Dev%2FAPT|APT Signing Key Folders and Other Development Notes]]
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