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ArchLinux 更新报错，主要两类错误，一个是 ffmpeg2.8，另一个是 libxfont。

报错如下：

looking for conflicting packages...

error: failed to prepare transaction (could not satisfy dependencies)
:: ffmpeg2.8: installing libvpx (1.7.0-1) breaks dependency 'libvpx.so=4-64'
:: ffmpeg2.8: removing libx264 breaks dependency 'libx264.so=148-64'
:: ffmpeg2.8: installing x265 (2.8-1) breaks dependency 'libx265.so=130-64'
:: libxfont: removing fontsproto breaks dependency 'fontsproto>=2.1.3'

0123456
looking for conflicting packages...error: failed to prepare transaction (could not satisfy dependencies):: ffmpeg2.8: installing libvpx (1.7.0-1) breaks dependency 'libvpx.so=4-64':: ffmpeg2.8: removing libx264 breaks dependency 'libx264.so=148-64':: ffmpeg2.8: installing x265 (2.8-1) breaks dependency 'libx265.so=130-64':: libxfont: removing fontsproto breaks dependency 'fontsproto>=2.1.3'

查看 pacman 版本

pacman -V

 .--.                  Pacman v5.0.2 - libalpm v10.0.2
/ _.-' .-.  .-.  .-.   Copyright (C) 2006-2016 Pacman Development Team
\  '-. '-'  '-'  '-'   Copyright (C) 2002-2006 Judd Vinet
 '--'
                       This program may be freely redistributed under
                       the terms of the GNU General Public License.

01234567
pacman -V .--.                  Pacman v5.0.2 - libalpm v10.0.2/ _.-' .-.  .-.  .-.   Copyright (C) 2006-2016 Pacman Development Team\  '-. '-'  '-'  '-'   Copyright (C) 2002-2006 Judd Vinet '--'                       This program may be freely redistributed under                       the terms of the GNU General Public License.

解决方法

更新 vlc

sudo pacman -Sy vlc

0
sudo pacman -Sy vlc

删除 ffmpeg2.8

sudo pacman -R ffmpeg2.8

0
sudo pacman -R ffmpeg2.8

删除 libxfont

sudo pacman -Rs libxfont
checking dependencies...
error: failed to prepare transaction (could not satisfy dependencies)
:: xorg-bdftopcf: removing libxfont breaks dependency 'libxfont'

0123
sudo pacman -Rs libxfontchecking dependencies...error: failed to prepare transaction (could not satisfy dependencies):: xorg-bdftopcf: removing libxfont breaks dependency 'libxfont'

删除报错，尝试更新 xorg-bdftopcf

sudo pacman -Sy xorg-bdftopcf

0
sudo pacman -Sy xorg-bdftopcf

再次删除 libxfont

sudo pacman -Rs libxfont

0
sudo pacman -Rs libxfont

最后更新系统，pacman -Syu，成功执行。

解决这些问题的思路大致如下：

• 更新依赖软件包的软件
• 删除软件包
• 更新系统

一级一级的往下找，如果发现下级依赖超级多，那肯定不应该是全部删除，只能尝试更新。

为什么系统更新这么麻烦，还是需要去做这件事情呢？主要还是不更新，后续软件都没法装了。

参考：https://bbs.archlinux.org/viewtopic.php?id=237522 http://tieba.baidu.com/p/5715672675 http://tieba.baidu.com/p/5723755919 https://www.v2ex.com/amp/t/430321