Packages not signed with the official CentOS keys will not be upgraded. These packages are typically provided by third parties, or they have been modified in some way. There is a high risk of incompatibility with these packages as they have not been verified by CentOS. For the upgrade assistance, contact the vendors of these packages.
You can find a list of all unsigned packages including their vendors' names in the [link: /root/preupgrade/kickstart/noncentospkgs] file.


