APT: "gpgv: Can't check signature: public key not found"

dummy@example.com (msi) — Mon, 10 Jul 2017 19:02:13 +0000

When I just ran

# apt-get source linux-image-3.16.0-4-686-pae

I got the following error message:

gpgv: keyblock resource `/root/.gnupg/trustedkeys.gpg': file open error
gpgv: Signature made Mon Jun 26 18:46:15 2017 CEST using RSA key ID 95861109
gpgv: Can't check signature: public key not found
dpkg-source: warning: failed to verify signature on ./linux_3.16.43-2+deb8u2.dsc

This may or may not be related to a note apt displayed earlier:

Picking 'linux' as source package instead of 'linux-image-3.16.0-4-686-pae'
NOTICE: 'linux' packaging is maintained in the 'Git' version control system at:
https://anonscm.debian.org/git/kernel/linux.git

I even downloaded that missing public key with

# gpg --recv-keys 95861109

and still got the same error.

Dev1 Galaxy Forum / APT: "gpgv: Can't check signature: public key not found"

APT: "gpgv: Can't check signature: public key not found"