When I open my laptop, before loading the SDDM, the screen will say:
[FAILED] failed to start pkgfile database update
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$ systemctl | grep pkgfile
● pkgfile-update.service loaded failed failed pkgfile database update
pkgfile-update.timer loaded active waiting pkgfile database update timer
So … why do you use pkgfile ?
(its not default, I dont use it, pacman has similar functionality, etc)
I have never used it, maybe it is a default in yay or AUR
If I delete that:
sudo pacman -Rsn pkgfile
正在检查依赖关系...
错误：无法准备事务处理 (无法满足依赖关系)
:: 删除 pkgfile 破坏依赖 'pkgfile' （manjaro-zsh-config 需要）
which means manjaro-zsh config needs this
It is not.
Even installing the package (from the repo, or the -git version from AUR) wont automatically start the services for you … so you did this on purpose at some point.
I guess we can look for anything relying on pkgfile…
pactree -r pkgfile
Or
pacman -Qi pkgfile | grep Required
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maybe it is because I use oh-my-zsh as default terminal
I dont think so … that would be a very odd depend for zsh or zsh theming, etc.
Why not run one of the commands I provided so we can see if anything relies on it ?
EDIT.
Oh … I see your edit above contains more info.
huh. your zsh config seems to be acting funny if the grep didnt work.
In any case … yeah I saw your edit above , its not ‘oh-my-zsh’ … but it is from manjaro-zsh-config.
No idea why… oh so I looked into it.
It appears its a dep for one single function of “command-not-found.zsh”.
A whole package and a service and a timer for one action? Not something I would do.
But unless you want to modify that package or remove it … seems you are stuck with pkgfile.
In that case … you might want to manually initiate a pkgfile refresh:
sudo pkgfile -u
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(base) [11:02:04] firestar:~ $ sudo pkgfile -u
:: Updating 4 repos...
core is up to date
extra is up to date
community is up to date
multilib is up to date
yes it is just like sudo pacman -Syyu
And on a restart do you see the same error?
I noticed that pkgfile service will lock the db from time to time. Maybe we can ping @Chrysostomus to have a look at it. 
It is used be manjaro-zsh-config for command not found hook. Pamac and pacman have similar functionality, but pkgfile has significantly better performance. You don’t want to have your terminal stuck for several seconds when you type in a nonexistent command. With pkgfile the results are practically instant. And for this it needs to update the files database from from time to time. The service does this in the background.
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No, it is not.
when I closed my computer there still was, but when I open it again it did not show the same error
i have same issue from a fresh install of manjaro (KDE edition), i didnt even know manjaro comes with zsh. but it seems its pre installed.
can i safely remove manjaro-zsh-config? or zsh entirely? i dont want a service to be running in the backround when i dont even use zsh
If you are using bash or fish instead, then yes, you can remove it without any issues. Only gnome edition comes with zsh enabled by default.
thanks, this is the command i used
sudo pacman -Rsu manjaro-zsh-config zsh-autosuggestions zsh-completions zsh-history-substring-search zsh-syntax-highlighting zsh
seems to work fine 
How to auto-update pkgfile and do not see this warning again? Can I use .desktop file to solve this?
.desktop file does not work!
Let us try the solution below by @ThalesMarcel