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Best regards, I recently tried to open “Software” in Ubuntu Studio Disco Dingo 19.04, to search for an application and continuously issues the following message:

enter image description here

Unable to download updates:
failed to refresh cache: W: GPG error: http://archive.canonical.com lucid InRelease: the following signatures couldn`t be verified because the public key is not abvailable: NO_PUBKEY 40976EAF437D05B5"
Kulfy
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Jesús Odremán
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    Are you sure about lucid (lynx, 10.04 LTS)? What is your Ubuntu version? Was it a clean install or upgrade from 10.04 LTS? – N0rbert Sep 18 '19 at 15:51
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    open a shell/terminal/bash prompt and type lsb_release -a, press enter, then copy the printed text into your posting. – Hannu Sep 18 '19 at 16:17

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To me, it seems as though you added a PPA or repository that is looking for a "lucid" version of its repo, which is outdated. If you remove that repo/PPA from your repositories using the "Software and Updates" tool, you might be able to get past this.

"Lucid Lynx", aka 10.04, is long-since outdated.

Erich Eickmeyer
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