[root@VM-16-9-centos docker-kubuntu]# docker run --rm -it ubuntu:22.04 bash root@8ac245b487e6:/# apt update Get:1 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB] Get:2 http://archive.ubuntu.com/ubuntu jammy InRelease [270 kB] Err:1 http://security.ubuntu.com/ubuntu jammy-security InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C Err:2 http://archive.ubuntu.com/ubuntu jammy InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C Get:3 http://archive.ubuntu.com/ubuntu jammy-updates InRelease [109 kB] Err:3 http://archive.ubuntu.com/ubuntu jammy-updates InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C Get:4 http://archive.ubuntu.com/ubuntu jammy-backports InRelease [90.7 kB] Err:4 http://archive.ubuntu.com/ubuntu jammy-backports InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C Reading package lists... Done W: http://security.ubuntu.com/ubuntu/dists/jammy-security/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: http://security.ubuntu.com/ubuntu/dists/jammy-security/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: GPG error: http://security.ubuntu.com/ubuntu jammy-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C E: The repository 'http://security.ubuntu.com/ubuntu jammy-security 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. W: http://archive.ubuntu.com/ubuntu/dists/jammy/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: http://archive.ubuntu.com/ubuntu/dists/jammy/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: GPG error: http://archive.ubuntu.com/ubuntu jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C E: The repository 'http://archive.ubuntu.com/ubuntu jammy 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. W: http://archive.ubuntu.com/ubuntu/dists/jammy-updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: http://archive.ubuntu.com/ubuntu/dists/jammy-updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: GPG error: http://archive.ubuntu.com/ubuntu jammy-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C E: The repository 'http://archive.ubuntu.com/ubuntu jammy-updates 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. W: http://archive.ubuntu.com/ubuntu/dists/jammy-backports/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: http://archive.ubuntu.com/ubuntu/dists/jammy-backports/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg are ignored as the file is not readable by user '_apt' executing apt-key. W: GPG error: http://archive.ubuntu.com/ubuntu jammy-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C E: The repository 'http://archive.ubuntu.com/ubuntu jammy-backports 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. E: Problem executing scripts APT::Update::Post-Invoke 'rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true' E: Sub-process returned an error code