So, apparently, the Software Center can't deal with conflicts correctly, thus I'm reassigning this bug to it. That libavcodec-ffmpeg56 and libavcodec-ffmpeg-extra56 conflict is intentional and certainly not a bug.
** Package changed: ffmpeg (Ubuntu) => software-center (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1511571 Title: package libavcodec-ffmpeg56 (not installed) failed to install/upgrade: conflicting packages - not installing libavcodec-ffmpeg56:amd64 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/1511571/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs