I am getting the same issues you are describing on a Dell XPS 17 L702. UEFI booting is not an available option, nor is a BIOS update (checked the Dell site for newer BIOS). I grabbed the casper.log and the dmesg output in case that provides any insights.
** Attachment added: "Casper.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1212977/+attachment/3889273/+files/casper.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1212977 Title: [Dell Optiplex 990] Saucy daily-live images are unbootable, stuck in BusyBox shell To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1212977/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
