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openat(AT_FDCWD, "/usr/share/keyrings/docker-archive-keyring.gpg", O_RDONLY) = 6 access("/usr/share/keyrings/docker-archive-keyring.gpg", R_OK) = 0 access("/usr/share/keyrings/docker-archive-keyring.gpg", F_OK) = 0 openat(AT_FDCWD, "/usr/share/keyrings/docker-archive-keyring.gpg", O_RDONLY) = 4 faccessat(AT_FDCWD, "/usr/share/keyrings/docker-archive-keyring.gpg", R_OK) = 0 # strace -f apt update 2>&1 | grep docker-archive-keyring

# chmod o+r /usr/share/keyrings/docker-archive-keyring.gpg faccessat(AT_FDCWD, "/usr/share/keyrings/docker-archive-keyring.gpg", R_OK) = -1 EACCES (Permission denied) Strace -f apt update 2>&1 | grep docker-archive-keyring rw-rw- 1 root root 2760 Aug 17 06:46 /usr/share/keyrings/docker-archive-keyring.gpg # ls -l /usr/share/keyrings/docker-archive-keyring.gpg

Make sure /usr/share/keyrings/docker-archive-keyring.gpg is global readable. Gpg: keyserver receive failed: No keyserver available N: See apt-secure(8) manpage for repository creation and user configuration have also ran the below command but no luck sudo apt-key adv -keyserver -recv-keys 7EA0A9C3F273FCD8Įxecuting: /tmp/apt-key-gpghome.rDOuMCVLF2/gpg.1.sh -keyserver -recv-keys 7EA0A9C3F273FCD8 N: Updating from such a repository can't be done securely, and is therefore disabled by default. **E: The repository ' bionic InRelease' is not signed.** W: GPG error: bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8 The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8** I am getting the below error message when running the below command for installing docker and kubernetes in Ubuntu server.