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Debian 8 owncloud client signature verification NO_PUBKEY 4ABE1AC7557BEFF9

You have a Debian 8 installation and get an error like the following when you want to install or update the owncloud client?

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error:  Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4ABE1AC7557BEFF9

W: Failed to fetch  

W: Some index files failed to download. They have been ignored, or old ones used instead.

Execute the following command and try it again.

sudo apt-key adv --keyserver --recv-keys 4ABE1AC7557BEFF9
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