The no_pubkey solution appears when apt-Get update is used in Debian.

Prompt when updating with APT-Get update

 

W: GPG error:Http://ftp.debian-unofficial.orgEtch release: The following
Signatures couldn't be verified because the public key is not available:
No_pubkey d5642bc86823d007
W: You may want to run apt-Get update to correct these problems

 

The reason for the above problem is that there is no public key,Http://ftp.debian-unofficial.orgThe signature cannot be verified! Just re-import the public key!

 

GPG -- keyserver subkeys.pgp.net -- Recv-keys d5642bc86823d007

GPG -- export d5642bc86823d007 | apt-key add-

 

Write a script to handle this problem

#! /Bin/sh

If [! #-EQ 0]

Then

Echo usage: $0 keys

Exit 1

Fi

 

GPG -- keyserver subkeys.pgp.net -- Recv-keys $1

GPG -- export $1 | apt-key add-