[root@outrun outrun]# pacman -Syu
:: Synchronizing package databases...
core is up to date
extra is up to date
community is up to date
archlinuxfr is up to date
:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...
Packages (21) ca-certificates-mozilla-3.29.3-2 ca-certificates-utils-20170307-1 chromium-57.0.2987.110-1
empathy-3.12.12+111+g3300c6deb-1 gnome-control-center-3.22.2+2+g97e4d87ae-1 gnome-settings-daemon-3.22.2-1
gtk-update-icon-cache-3.22.10-1 gtk3-3.22.10-1 gtk3-print-backends-3.22.10-1 jasper-2.0.12-1
libdmapsharing-2.9.37+1+ge9fe3e0-1 libvoikko-4.1-1 libxslt-1.1.29+42+gac341cbd-1 linux-4.10.2-1
linux-firmware-20170309.695f2d6-1 linux-headers-4.10.2-1 nss-3.29.3-2 p11-kit-0.23.5-1
pacman-mirrorlist-20170316-1 python-pyparsing-2.2.0-1 xorg-mkfontdir-1.0.7-8
Total Installed Size: 635.28 MiB
Net Upgrade Size: 21.40 MiB

与ca-certificates-utils包有冲突
反而要安ca-certificates-utils-20170307-1 这种一看名字就不靠谱的包

看官网第一篇post

我把提示中的文件备份下就更新好了

3楼正解

https://www.archlinux.org/news/ca-certificates-utils-20170307-1-upgrade-requires-manual-intervention/

滚的时候有问题先上官网看新闻