archlinux downloading required keys

1.问题

　　

 解决办法:

rm -R /etc/pacman.d/gnupg/
(if this dir exists) rm -R /root/.gnupg/
gpg --refresh-keys
pacman-key --init && pacman-key --populate
pacman-key --refreash-keys

2.ERROR: A specified local key could not be updated from a keyserver

　　　　

解决办法：

1. 编辑 /etc/pacman.d/gnupg/gpg.conf
    新增 keyserver hkp://ipv4.pool.sks-keyservers.net:11371
2.初始化秘钥
    pacman-key --init
    pacman-key --populate archlinux
    pacman-key --refresh-keys