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I'm following this guide, but once I run apt update, I get this error:
GPG error: https://download.docker.com/linux/debian bullseye InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8The repository 'https://download.docker.com/linux/debian bullseye InRelease' is not signed.
Any help is appreciated!
this works instead
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \
$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
You can also make sure that the gpg file is readable by all users. Mine was not and changing that permission solved the problem, as stated in official Install guide!
To complement Marcus' answer:
make sure the permissions are set correctly by the following commands:
sudo chmod a+rx /etc/apt/keyrings
sudo chmod a+r /etc/apt/keyrings/docker.gpg
