Hi, archlinux-keyring 20160123-1 is needed, but not available, if testing isn't used. Packages (11) boost-1.60.0-2 boost-libs-1.60.0-2 cmake-3.4.2-1 confuse-2.8-1 dhcpcd-6.10.1-1 libvpx-1.5.0-4 ntp-4.2.8.p6-1 openmpi-1.10.2-1 pacman-mirrorlist-20160124-1 python-setuptools-1:19.6-1 python2-setuptools-1:19.6-1 error: confuse: signature from "Thorsten Töpper " is unknown trust :: File /var/cache/pacman/pkg/confuse-2.8-1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)). # pacman-key --refresh-keys --updatedb This fixed the issue with the signature. However, the current keyring package isn't available. "archlinux-keyring 20160123-1" - https://www.archlinux.org/packages/testing/any/archlinux-keyring/ "archlinux-keyring 20151220-1" - https://www.archlinux.org/packages/core/any/archlinux-keyring/ # pacman -Q archlinux-keyring archlinux-keyring 20151220-1 # pacman -Si archlinux-keyring | grep Ver Version : 20151220-1 Regards, Ralf