I’m unable to refresh the openSUSE_Leap_15.1 repo of owncloud (http://download.owncloud.org/download/repositories/stable/openSUSE_Leap_15.1) with zypper.
zypper refresh results in this error:
Signature verification failed for file 'repomd.xml' from repository 'ownCloud Server Version stable (openSUSE_Leap_15.1)'. Note: Signing data enables the recipient to verify that no modifications occurred after the data were signed. Accepting data with no, wrong or unknown signature can lead to a corrupted system and in extreme cases even to a system compromise. Note: File 'repomd.xml' is the repositories master index file. It ensures the integrity of the whole repo. Warning: This file was modified after it has been signed. This may have been a malicious change, so it might not be trustworthy anymore! You should not continue unless you know it's safe.