Ok, mdadm is the package for software raid, dmraid is for fake hardware raid support. Reassigning to the correct package. Also, I tried to reproduce the error in a VM and don't get any prompt about continuing to boot; I just get dropped to the busybox shell, just like in previous Ubuntu versions. Passing bootdegraded=true lets the system boot normally, just as in previous releases. The screen shot I was asking for was for the "continue to boot" prompt, but what you posted just shows the busybox shell.
Ok, mdadm is the package for software raid, dmraid is for fake hardware raid support. Reassigning to the correct package. Also, I tried to reproduce the error in a VM and don't get any prompt about continuing to boot; I just get dropped to the busybox shell, just like in previous Ubuntu versions. Passing bootdegraded=true lets the system boot normally, just as in previous releases. The screen shot I was asking for was for the "continue to boot" prompt, but what you posted just shows the busybox shell.