my solution was to edit UUIDs of every filesystem partition included in dmraid/fakeraid devices, so i can boot livecd and /dev/mapper appears after dmraid install
-- Cannot start from dmraid device anymore https://bugs.launchpad.net/bugs/141435 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs