At first, I am sorry in advance if my English is not as good as I would like. This isn't my native language.
I recently turn my computer into Debian. It work well, but there is just one little problem with repository keyring.
When I launch a “sudo apt-get update” command, I always have the message
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W: http://security.debian.org/dists/stretch/updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg are ignored as the file is not readable by user '_apt' executing apt-key.
So, I changed the rights of trusted.gpg. Only the root was allowed to read an write it. Now everybody can read it.
The message changed for :
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W: Impossible to get http://ftp.fr.debian.org/debian/dists/stretch/Release.gpg The following signatures haven't been verified because the public key isn't available : NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 NO_PUBKEY EF0F382A1A7B6500 [retranslated to English, the original message can be slightly different]