W: There is no public key available for the following key IDs: 1397BC53640DB551
$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1397BC53640DB551
The command above download the missing key using the hexadecimal numbers given in the error (1397BC53640DB551) with apt-key. After running apt-key to download the missing PUBKEY, any packages from that repositories will be considered trusted.
W: There is no public key available for the following key IDs: 1397BC53640DB551
Reviewed by vivek sathisan
on
10:54
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