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This question already has an answer here:

I have been googling for hours trying to find a way to get rid of the annoying gpg-error referring to the link below.

W: GPG error: http://download.opensuse.org Release: The following signatures could not be verified because the public key is not available: NO_PUBKEY 9A5EED8CBCA00D90

I have tried:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 9A5EED8CBCA00D90

but to no avail.

Google Translated error message:

The following signatures could not be verified because the public key is not available

marked as duplicate by muru, roadmr, Eliah Kagan, Eric Carvalho, Rinzwind Sep 11 '14 at 7:43

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Please translate the error message... – Jan Sep 9 '14 at 20:49
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    I don't see why openSUSE keys should be in the Ubuntu keyserver. Look through the openSUSE documentation, I'm sure they'll have steps to get the key. – muru Sep 9 '14 at 20:58
  • W: GPG error: download.opensuse.org Release: The following signatures could not be verified because the public key is not available: NO_PUBKEY 9A5EED8CBCA00D90 – tomoqv Sep 10 '14 at 7:57
  • @EliahKagan: I have looked at the suggested duplicate and tried everything there, but it has not helped. – tomoqv Sep 10 '14 at 8:01
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    Aah, thanks! I found the culprits in /etc/apt/sources.list.d/trojita-nightly.list and /etc/apt/sources.list.d/trojita-nightly.list.save, so I removed both files and now the error is gone. – tomoqv Sep 10 '14 at 18:16
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If you don't need the source, you can look up and remove/comment the source entries. To find out where they are:

grep -iR opensuse /etc/apt/sources.list*

In all likelihood, they are in the sources.list.d folder, so this command should disable such entries:

sudo sed -i '/opensuse/ s/^/#/' /etc/apt/sources.list.d/*.list

You can ignore files with the .save extension.

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