今天，我在尝试升级我的Arch Linux系统时遇到了这个错误“提交事务冲突文件失败：ca certificates utils:/etc/ssl/certs/ca-certificates.crt已经存在于文件系统中”。
"Failed to commit transaction Conflicting files: ca-certificates-utils: /etc/ssl/certs/ca-certificates.crt already exists in filesystem"

如果您遇到类似的错误，这里有一个快速的解决方法来修复它。
打开终端，逐个运行以下命令：
首先，使用以下命令下载软件包：

$sudo pacman -Syuw

示例输出将是：

:: Synchronizing package databases...
 core is up to date
 extra is up to date
 community is up to date
 multilib is up to date
 archlinuxfr is up to date 0.0 B 0.00B/s 00:00 [----------------------] 0%
 xyne-x86_64 is up to date
:: Starting full system upgrade...
resolving dependencies...
Packages (25) ca-certificates-20160307-1 ca-certificates-mozilla-3.29.3-2
 ca-certificates-utils-20160307-1 deepin-api-3.1.4-1
 deepin-clutter-1.26.2-1 deepin-control-center-4.0.10-1
 deepin-desktop-base-2015.11.30-1 deepin-file-manager-1:1.4.10-1
 deepin-mutter-3.20.13-2 deepin-wallpapers-1.4-1
 deepin-wm-1.9.7-2 libxslt-1.1.29+42+gac341cbd-1
 linux-firmware-20160309.695f2d6-1 nss-3.29.3-2 p11-kit-0.23.5-1
 pacman-mirrorlist-20160316-1 python-pyparsing-2.2.0-1
 python2-asn1crypto-0.22.0-1 python2-cssutils-1.0.2-1
 python2-pyparsing-2.2.0-1 qt4-4.8.7-16 qt5-webengine-5.8.0-4
 smplayer-17.3.0-1 startdde-3.1.5-1 xorg-mkfontdir-1.0.7-8
Total Download Size: 0.00 MiB
:: Proceed with download? [Y/n] y
(25/25) checking keys in keyring [########] 100%
(25/25) checking package integrity

接下来，删除冲突文件(例如：/etc/sl/certs/ca-certificates.crt。

$sudo rm /etc/ssl/certs/ca-certificates.crt

最后，使用命令执行升级：

$sudo pacman -Su

现在，更新过程顺利进行。

:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...
:: deepin-clutter and clutter are in conflict. Remove clutter? [y/N] y
Packages (26) ca-certificates-20160307-1 ca-certificates-mozilla-3.29.3-2
 ca-certificates-utils-20160307-1
 clutter-1.26.0+24+g79da526-1 [removal] deepin-api-3.1.4-1
 deepin-clutter-1.26.2-1 deepin-control-center-4.0.10-1