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Trusty installation is combined root + /boot within LVM on top of mdraid (type 1.x) RAID1 with one missing disk (degraded).
[method:  basically create the setup in shell first then point install at the lvm.  at end of install create a chroot and add mdadm pkg]

boot fails with the following messages:
 Incrementally starting RAID arrays...
 mdadm: CREATE user root not found
 mdadm: CREATE group disk not found
 Incrementally starting RAID arrays...
and slowly repeats the above at this point.

workaround:
- add break=premount to grub kernel line entry
- for continue visibility of boot output also remove quiet,  splash and possibly set gxmode 640x480

now @ initramfs prompt:
mdadm --detail /dev/md0 should indicate a state of clean, degraded, array is started so this part is ok

lvm lvs output attributes are as follows:
-wi-d----  (instead of the expected -wi-a----)
lvs manpage this means device tables are missing (device mapper?)

FIX: simply run lvm vgchange -ay and exit initramsfs.  This will lead to
a booting system.

** Affects: lvm2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: boot degraded lvm raid
-- 
boot fails on raid (md raid1) + LVM (combined / + /boot) + degraded
https://bugs.launchpad.net/bugs/1351528
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