Alan, GPG KEY is not the only problem, there is one more problem in ver 4 of RB Feeder.
Up to ver 3.5, it used to take maximum 5 seconds to stop or restart when following command were issued:
sudo systemctl stop rbfeeder
sudo systemctl restart rbfeeder
Since release of ver 4, it takes over 60 seconds to execute these commands. Something is sure wrong.
Not only this defect makes restart of rbfeeder hang for over a minute, but when RPi is rebooted, that extra one minute is added to reboot time, as RPi cannot restart unless it first stops all the programs.
To overcome this problem I have uninstalled ver 4, and installed ver 3.5.
I could do this downgrade because I have downloaded and saved .deb package of ver 3.5 before upgrading it to ver 4.
Please advise Support/Software Developers to fix the abnormally long time to stop the rbfeeder.
Regards,
abcd567