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I'm getting a lot of errors like this:

W: An error occurred during the signature verification. 
The repository is not updated and the previous index files will be used. 
GPG error: http://ftp.uk.debian.org/debian stretch-updates 
InRelease: The following signatures couldn't be verified because the public key 
is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010

Tried to add the keys manually using:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8B48AD6246925553

and it says imported/processed but I still get the same errors.

agc
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Lom Dass
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    You should clarify in the question which operating system it is that you are actually using, Ubuntu or Debian. – JdeBP Oct 20 '17 at 06:03

1 Answers1

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I suggest these: 

sudo apt-get clean
sudo mv /var/lib/apt/lists /tmp
sudo mkdir -p /var/lib/apt/lists/partial
sudo apt-get clean
sudo apt-get update
FargolK
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