JFYI: LANG=C yum update --noplugins ... Error: Failed to download metadata for repo 'appstream': repomd.xml GPG signature verification error: Bad GPG signature http://mirror.centos.org/centos-8/8/AppStream/x86_64/os/repodata/ shows repomd.xml 2021-03-16 15:43 repomd.xml.asc 2021-03-03 00:29 -- Leon