If you get this error message when trying to update the system (see example below) or just pinging an external host … $> sudo pacman -Syu :: Synchronizing package databases... error: failed retrieving file 'core.db' from mirror.archlinuxarm.org : Could not resolve host: mirror.archlinuxarm.org error: failed to update core (download library error) error: failed retrieving file 'extra.db' […]