Security updates for Thursday

Security updates have been issued by Arch Linux (chromium, curl, dhclient, dhcp, firefox, keycloak, lib32-curl, lib32-libcurl-compat, lib32-libcurl-gnutls, libcurl-compat, libcurl-gnutls, opera, packagekit, pam-u2f, postgresql, rabbitmq, redis, ruby-bundler, and zint), Debian (caribou, firefox-esr, imagemagick, and isc-dhcp), Fedora (mapserver, mingw-python-pillow, and python-pillow), openSUSE (chromium), Red Hat (firefox, glib2, pki-core:10.6, polkit, rh-ruby26-ruby, and rh-ruby27-ruby), SUSE (ceph, dhcp, libwebp, nginx, qemu, squid, and xstream), and Ubuntu (firefox, linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-snapdragon, linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oracle, and policykit-1).