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I'm trying to install AviSynth+ from yuuki-deb.x86.men.

$ cat /etc/apt/sources.list.d/yuuki-deb.sources Types: deb URIs: http://yuuki-deb.x86.men/ Suites: bullseye Components: main Signed-By: /usr/share/keyrings/yuuki-deb.gpg Enabled: yes $ ls -l /usr/share/keyrings/yuuki-deb.gpg -rw-r--r-- 1 root root 433 Sep 7 20:23 /usr/share/keyrings/yuuki-deb.gpg $ gpg --show-keys /usr/share/keyrings/yuuki-deb.gpg pub ed25519 2020-03-03 [SCA] A9BBA31152359AE080A1DF851F331533ABCDEEA3 uid AviSynth+ Yuuki Debian Repository <[email protected]> # apt update -*- snip -*- Err:4 http://yuuki-deb.x86.men bullseye InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1F331533ABCDEEA3 -*- snip -*-

It seems to be completely ignoring the Signed-By directive. How can I fix this?

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2 Answers 2

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apt checks file extensions, not file contents, to determine the file type of public keys. The resulting errors are, apparently, sometimes silent. Renaming the key to yuuki-deb.asc, and updating the Signed-By line to match, allowed me to install packages from the repository.

Thanks to GAD3R's answer for setting me on the right track. I attempted to manually implement the apt-key add workaround with mv, and identified the real problem thanks to this apt update error message:

W: http://yuuki-deb.x86.men/dists/bullseye/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/yuuki-deb.gpg are ignored as the file has an unsupported filetype.
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For Debian releases older than Trixie (also known as Debian 13), the yuuki-deb documentation recommends the deprecated (since bullseye (also known as Debian 11)!) apt-key tool to add the gpg key and the one line style format repository:

For old Debian releases:

curl https://yuuki-deb.x86.men/yuuki-deb.gpg | apt-key add - echo "deb http://yuuki-deb.x86.men/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/yuuki-deb.list
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