The following security updates have been released for Ubuntu Linux: [USN-6550-1] PostfixAdmin vulnerabilities [USN-6551-1] Ghostscript vulnerability [USN-6552-1] Netatalk vulnerability [USN-6554-1] GNOME Settings vulnerability [USN-6548-2] Linux kernel vulnerabilities [USN-6534-2] Linux kernel vulnerabilities [USN-6549-2] Linux kernel (GKE) vulnerabilities