Hi, if you got the following error: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY xxxxxx just update the APT key: curl -4 http://download.opensuse.org/repositories/home:/laszlo_budai:/syslog-ng/xUbu... | sudo apt-key add - (if you are using other version of Debian/Ubuntu, set the correct version) and then apt-get update && apt-get upgrade regards, Laszlo Budai