error: at-spi2-core: signature from "Ionut Biru <ibiru@archlinux.org>" is unknown trust
error: at-spi2-atk: signature from "Ionut Biru <ibiru@archlinux.org>" is unknown trusterror: cmake: signature from "Dave Reisner <d@falconindy.com>" is unknown trusterror: colord: signature from "Ionut Biru <ibiru@archlinux.org>" is unknown trusterror: gpgme: signature from "Dave Reisner <d@falconindy.com>" is unknown trusterror: gmime: signature from "Ionut Biru <ibiru@archlinux.org>" is unknown trusterror: gvfs: signature from "Dave Reisner <d@falconindy.com>" is unknown trusterror: gvfs-obexftp: signature from "Dave Reisner <d@falconindy.com>" is unknown trusterror: inetutils: signature from "Eric Belanger <eric@archlinux.org>" is unknown trusterror: intltool: signature from "Eric Belanger <eric@archlinux.org>" is unknown trusterror: libreoffice-en-US: signature from "Andreas Radke <andyrtr@archlinux.org>" is unknown trusterror: libreoffice-common: signature from "Andreas Radke <andyrtr@archlinux.org>" is unknown trusterror: libreoffice-calc: signature from "Andreas Radke <andyrtr@archlinux.org>" is unknown trusterror: libreoffice-gnome: signature from "Andreas Radke <andyrtr@archlinux.org>" is unknown trusterror: libreoffice-writer: signature from "Andreas Radke <andyrtr@archlinux.org>" is unknown trusterror: sdl_image: signature from "Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>" is unknown trusterror: sdl_mixer: signature from "Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>" is unknown trusterror: sdl_ttf: signature from "Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>" is unknown trusterror: totem-plparser: signature from "Ionut Biru <ibiru@archlinux.org>" is unknown trust
出现这些错误之后，要修改/etc/pacman.conf.new
把
SigLevel = Optional TrustAll
这一行之前的#去掉
在
SigLevel = Never
这一行之前加上#
解决方法来自于
http://www.archlinuxcn.org/viewtopic.php?f=22&t=533