Error key "xxx...xxx" could not be looked up remotely on ArchLinux

 Here is the answer that worked for me, from:

https://superuser.com/questions/1675153/error-key-xxx-xxx-could-not-be-looked-up-remotely-on-archlinux


pacman-key --init

pacman-key --populate archlinux
 

Then tried 


pacman -Sy sudo

again and it was fine!

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