Docker: How to solve the public key error in ubuntu while installing docker

Question

I am getting the below error message when running the below command for installing docker and kubernetes in Ubuntu server.

root@master:/home/ubuntu# add-apt-repository \
>   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
>   $(lsb_release -cs) \
>   stable"
Hit:1 http://in.archive.ubuntu.com/ubuntu bionic InRelease
Get:2 https://download.docker.com/linux/ubuntu bionic InRelease [64.4 kB]
Hit:3 http://in.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:4 http://in.archive.ubuntu.com/ubuntu bionic-backports InRelease
Hit:5 http://in.archive.ubuntu.com/ubuntu bionic-security InRelease
**Err:2 https://download.docker.com/linux/ubuntu bionic InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8**
Reading package lists... Done
W: GPG error: https://download.docker.com/linux/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8
**E: The repository 'https://download.docker.com/linux/ubuntu bionic InRelease' is not signed.**
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
root@master:/home/ubuntu#

I have also ran the below command but no luck

root@master:/# sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7EA0A9C3F273FCD8
Executing: /tmp/apt-key-gpghome.rDOuMCVLF2/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 7EA0A9C3F273FCD8
gpg: keyserver receive failed: No keyserver available

Answer 1

I had this exact problem. I believe it was caused by my default umask, which caused some of the Docker files to be installed with incorrect permissions. I was able to fix it by correcting the file permissions the docker key file:

sudo chmod a+r /usr/share/keyrings/docker-archive-keyring.gpg

Answer 2

EDIT: This apparently does not work any more.

Run this to add the correct key:

# Does not work any more
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Source: https://docs.docker.com/install/linux/docker-ce/ubuntu/