Hi I have ubuntu Server install 16.X with all dependency packages #124-Ubuntu SMP Fri Nov 10 18:29:59 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux # more /etc/debian_version stretch/sid when i try to install syslog-ng with debian package as mentioned below steps. ~# more /etc/apt/sources.list.d/syslog-ng-obs.list deb http://download.opensuse.org/repositories/home:/laszlo_budai:/syslog-ng/xUbu... ./ # apt-get update Hit:1 http://gb.archive.ubuntu.com/ubuntu xenial InRelease Hit:2 http://gb.archive.ubuntu.com/ubuntu xenial-updates InRelease Get:3 http://gb.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB] Ign:4 http://download.opensuse.org/repositories/home:/laszlo_budai:/syslog-ng/xUbu... ./ InRelease Hit:5 http://download.opensuse.org/repositories/home:/laszlo_budai:/syslog-ng/xUbu... ./ Release Get:6 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB] Fetched 204 kB in 0s (350 kB/s) Reading package lists... Done # apt-get install syslog-ng-core Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: syslog-ng-core : Depends: libjson-c3 (>= 0.10) but it is not installable E: Unable to correct problems, you have held broken packages. But i have already install libjason package # apt-get install libjson-c-dev Reading package lists... Done Building dependency tree Reading state information... Done libjson-c-dev is already the newest version (0.11-4ubuntu2). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. what is the issue, how can i install latest version of syslog-ng default syslog-ng only come with 3.5.6 version, but iam looking 3.11 and above version to install any suggestions ? R!