Apt Error: The following signatures were invalid

[chrisspen]

The instructions to install the key and Debian packages on this page do not work.

Attempting to run:

wget -qO - http://goofy.zamia.org/repo-ai/debian/stretch/amd64/bofh.asc | sudo apt-key add -
sudo apt-get update

results in the error:

Err:11 http://goofy.zamia.org/repo-ai/debian/stretch/amd64 ./ InRelease                                                                                                                                                                                                                  
  The following signatures were invalid: EXPKEYSIG 5E5823F5B4F0DEA9 Guenter Bartsch <[email protected]>
Reading package lists... Done                                                                                                                                                                                                                                                            
W: GPG error: http://goofy.zamia.org/repo-ai/debian/stretch/amd64 ./ InRelease: The following signatures were invalid: EXPKEYSIG 5E5823F5B4F0DEA9 Guenter Bartsch <[email protected]>
E: The repository 'http://goofy.zamia.org/repo-ai/debian/stretch/amd64 ./ InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

I'm running this on Ubuntu 18. This worked perfectly for me about a month ago, but now whenever I run sudo apt update, it gives me this error, forcing me to completely purge the repo just so I can install other packages.

[svenha]

This is a duplicate of #85 - a temporary workaround is given there.

[chrisspen]

What's the workaround? That thread ends by saying to manually download and install armhf packages, which doesn't work for Ubuntu and doesn't fix the problem.

Has the repo been discontinued?

[svenha]

I have not tried it for Ubuntu. But you can download the correct files for Debian and install them manually: https://goofy.zamia.org/repo-ai/

[gooofy]

Sorry, the repos are outdated and no longer maintained due to time constraints on my side. I have removed links to them and closed them down now to avoid further confusion. Package sources remain available in the zamia dist repo on github.