Solution to W: There is no public key available for the following key IDs when Debian is updated

I just reinstalled the debian system, and this error occurred during the update:

W: There is no public key available for the following key IDs: 9D6D8F6BC857C906 W: There is no public key available for the following key IDs: 7638D0442B90D010

The solution is as follows:

apt-get install debian-keyring debian-archive-keyring apt-key update

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