使用 Archlinux 系统报错 key “*” could not be looked up remotely， required key missing from keyring ，最终导致更新失败。这类问题可以通过重新安装 archlinux-keyring 软件包解决。
在更新archlinux系统时报错：
(316/316) checking keys in keyring [#######################################################] 100%
downloading required keys…
error: key "********" could not be looked up remotely
error: required key missing from keyring
error: failed to commit transaction (unexpected error)
Errors occurred, no packages were upgraded.
需要重新安装archlinux-keyring包，执行以下命令
sudo pacman -S archlinux-keyring