Apt update error NO_PUBKEY 871920D1991BC93C

Heya,

The error you’re encountering indicates that the APT package manager is unable to verify the GPG signature of some repository because it lacks the necessary public key.

Can you share the complete error that you are getting here so I could advise you further?

Also, does this happen with a fresh Droplet or did it happen after installing some specific packages?

- Bobby

Heya,

The NO_PUBKEY 871920D1991BC93C error indicates that your system is missing the public key needed to authenticate packages from a repository.

Try adding the key using a keyserver. In some cases, certain keyservers may be unreliable. You can add the missing key using a trusted keyserver like keyserver.ubuntu.com:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 871920D1991BC93C

If this works, you should see a success message and the key will be added.

Heya,

As mentioned you can share the full error message so we can advise you which step is best to take in your particular case.

You can also try to remove and then re-add the key then run the apt-update command again, however I’ll recommend to provide us with the full error so we can make sure this is the best way to deal with the problem.

Regards