To get rid of dmraid you just don't install it. The live cd doesn't have the dmraid package preloaded and I'm sure getting rid of dmraid is as simple as un-installing it through apt and rebuilding the initramfs. (2 commands from the terminal)
This is no bug in dmraid. -- Dual-boot install using mdadm root fails to boot https://bugs.launchpad.net/bugs/392510 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs