Bug#1003865: Missing key

[Kamil Jońca]

Today I also faced this issue. 
I tried with and without apt-cacher-ng.

moreover (I do not know if I check properly)
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%gpg --keyserver keyring.debian.org --recv-key 0x648ACFD622F3D138
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
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