debian apt-get update:public key 错误修复

apt-get update 出现 这种错误
Reading package lists… Done
W: There is no public key available for the following key IDs:
7638D0442B90D010
W: There is no public key available for the following key IDs:
7638D0442B90D010
W: There is no public key available for the following key IDs:
9D6D8F6BC857C906

解决方法
apt-get install debian-keyring debian-archive-keyring
apt-get update

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