I just had this problem in 12.04 beta 1 amd64. I don't know if it has something to do with the bug, but as you can see on attached screenshot, the OS is trying to download a i386 version.
** Attachment added: "Preceeding window that request installing gstreamer-plugins-ugly" https://bugs.launchpad.net/ubuntu/+source/gst-plugins-bad0.10/+bug/914696/+attachment/2985911/+files/Screenshot%20from%202012-04-01%2023%3A00%3A43.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/914696 Title: Unmet dependencies in Ubuntu 12.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gst-plugins-bad0.10/+bug/914696/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs