docker
Instructions don't work on Debian 11 (public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8)
File: engine/install/debian.md
The Problem
The instructions don't work for Debian 11 (Bullseye). It shows the following error:
apt-get update
Hit:1 http://asi-fs-d.contabo.net/debian bullseye InRelease
Get:2 http://asi-fs-d.contabo.net/debian bullseye-updates InRelease [44.1 kB]
Hit:3 http://security.debian.org/debian-security bullseye-security InRelease
Hit:4 https://download.docker.com/linux/debian bullseye InRelease
Err:4 https://download.docker.com/linux/debian bullseye InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8
Fetched 44.1 kB in 1s (63.7 kB/s)
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. 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 7EA0A9C3F273FCD8
W: Failed to fetch https://download.docker.com/linux/debian/dists/bullseye/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8
W: Some index files failed to download. They have been ignored, or old ones used instead.
The fix
Instead of
- Add Docker’s official GPG key:
$ sudo mkdir -p /etc/apt/keyrings
$ curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
it should be
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/docker.gpg
and then instead of
- Use the following command to set up the repository:
$ echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \
$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
it should be
echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/trusted.gpg.d/docker.gpg] https://download.docker.com/linux/debian \
$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
Reason
The keyring /etc/apt/keyrings/docker.gpg will not be used by apt. It must be /etc/apt/trusted.gpg.d/docker.gpg.
i get the same error on Ubuntu instructions, following this guide and exchanging /etc/apt/keyrings/docker.gpg for /etc/apt/trusted.gpg.d/docker.gpg fixed it for me in ubuntu.
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