How to fix OwnCloud Key Expired Error

If you get an error like

W: A 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 were invalid: KEYEXPIRED 1397815516

W: Failed to fetch

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

You simply need to reimport the new key… copy and paste the command below

wget -qO - | sudo apt-key add -


Thanks to fkunz for the fix

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