Are you know your key has some error since ~13:00:

GPG error: http://download.opensuse.org/repositories/home:/laszlo_budai:/syslog-ng/xUbuntu_16.04 ./

BADSIG 3B92A8D27CFDAEDD home:laszlo_budai:syslog-ng OBS Project <home:laszlo_budai:syslog-ng@build.opensuse.org>

Regards,

Robert