Authentication Failure after force pacman -Syu

Yesterday I was trying to do an update but there were some conflicts, I don't remember which libraries. However, I forced the upgrade and now my system doesn't authenticate. That is, I use the root user and the correct password but I get "Wrong Password". When I try to log in via TTYs I get the same thing, i.e. when I enter root and the correct password, I get "Authentication Failure" but if I enter a wrong password for root I get "Incorrect Login". I really don't know what to do anymore, I'm right now in a Ubuntu chrooted to try to solve the problem but I don't know how to solve it. I leave some screenshots along with some logs that might be useful. Thanks a lot!

https://i.stack.imgur.com/wuUIL.jpg

https://i.stack.imgur.com/Ragak.jpg

https://i.stack.imgur.com/GhkTh.jpg

Command journalctl -xe
https://pastebin.com/3C9YG4fB

Command dmesg
https://pastebin.com/TyHN1yEN

pacman.conf
https://pastebin.com/iY8150H2

pacman mirrorlist
https://pastebin.com/VA4qM7ZX