-1

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
  • 18,154
Jesús Odremán
  • 1

1 Answers1

0

To me, it seems as though you added a PPA or repository that is looking for a "lucid" version of its repo, which is outdated.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"Lucid Lynx", aka 10.04, is long-since outdated.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
  • 510