➜ ~ sudo pacman -Syyu
:: Synchronizing package databases...
core 147.5 KiB 1378K/s 00:00 [#######################] 100%
extra 1796.2 KiB 5.43M/s 00:00 [#######################] 100%
community 4.8 MiB 8.92M/s 00:01 [#######################] 100%
multilib 180.0 KiB 3.52M/s 00:00 [#######################] 100%
:: Starting full system upgrade...
:: Replace compositeproto with extra/xorgproto? [Y/n]
:: Replace damageproto with extra/xorgproto? [Y/n]
:: Replace fixesproto with extra/xorgproto? [Y/n]
:: Replace fontsproto with extra/xorgproto? [Y/n]
:: Replace gnome-themes-standard with extra/gnome-themes-extra? [Y/n]
:: Replace gnome-tweak-tool with extra/gnome-tweaks? [Y/n]
:: Replace inputproto with extra/xorgproto? [Y/n]
:: Replace kbproto with extra/xorgproto? [Y/n]
:: Replace manjaro-gnome-extension-settings with community/manjaro-gnome-extension-settings-17.0? [Y/n]
:: Replace manjaro-gnome-extension-settings with community/manjaro-gnome-extension-settings-18.0? [Y/n]
:: Replace manjaro-gnome-maia-theme with community/manjaro-gdm-theme? [Y/n]
:: Replace manjaro-gnome-settings with community/manjaro-gnome-settings-17.0? [Y/n]
:: Replace manjaro-gnome-settings with community/manjaro-gnome-settings-18.0? [Y/n]
:: Replace pkg-config with core/pkgconf? [Y/n]
:: Replace randrproto with extra/xorgproto? [Y/n]
:: Replace recordproto with extra/xorgproto? [Y/n]
:: Replace renderproto with extra/xorgproto? [Y/n]
:: Replace scrnsaverproto with extra/xorgproto? [Y/n]
:: Replace videoproto with extra/xorgproto? [Y/n]
:: Replace xextproto with extra/xorgproto? [Y/n]
:: Replace xf86vidmodeproto with extra/xorgproto? [Y/n]
:: Replace xineramaproto with extra/xorgproto? [Y/n]
:: Replace xproto with extra/xorgproto? [Y/n]
resolving dependencies...
looking for conflicting packages...
error: unresolvable package conflicts detected
error: failed to prepare transaction (conflicting dependencies)
:: manjaro-gnome-extension-settings-18.0 and manjaro-gnome-extension-settings-17.0 are in conflict
今天刚才虚拟机里测试软件安装的系统，更新出现这个问题，仔细研究了一下。应该这样解决这个冲突，当问到是否替换17.0的时候选择NO，替换18.0的时候选择YES，如果反着来也可以，都已经实验过了。