Microsoft Secure Boot certificates expire, affecting Linux systems with potential boot issues

Microsoft's old Secure Boot certificates are expiring this month, potentially impacting Linux distributions that rely on the UEFI CA certificate authority for verification. The certificates from 2011, used for signing the Shim bootloader in Linux systems, are being replaced with 2023 versions. For Windows PCs, the transition is seamless as firmware already trusts Microsoft's signature keys, but Linux distributions require migration to the new certificate to maintain verified boot functionality.