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sudo pacman -Sy archlinux-keyring
sudo pacman-key --init
sudo pacman-key --populate archlinux
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如果 archlinux-keyring 也失效
vim /etc/pacman.conf 暂时设置 [core] 下 SigLevel = Never
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[core]
# ...
SigLevel = Never
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然后
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sudo pacman -Sy archlinux-keyring
# 或者
sudo pacman -U https://archlinux.org/packages/core/any/archlinux-keyring/download/
sudo rm -rf /var/cache/pacman/pkg/*
sudo rm -rf /etc/pacman.d/gnupg
sudo pacman-key --init
sudo pacman-key --populate archlinux
sudo pacman-key --refresh-keys
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再记得改回来