I don't believe this is dependent on lucid-proposed. I am also affected and I only have lucid-security and lucid-updates enabled. I also have the medibuntu repo in my software sources and it has been there for years.
If I run apt-cache policy I get the same result as Paul Crawford. Please let mo know what (if any) further information I can provide to help. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/751114 Title: ffmpeg unresolvable dependancies -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs