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If you experience errors about self-signed certificates, make sure you
update to the newest versions of ca-certificates-mozilla, nss and p11-kit.
If you experience pacman update problems due to a failing HTTPS mirror,
choose a plain-old HTTP mirror for this update.
If you still experience problems (I did on i486), then try to reinstall
ca-certifificates-mozilla after a full update:
pacman -Syyu
pacman -S ca-certifificates-mozilla
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