I have the very same problem and it freaks me out because i cannot return to 
the much older kernel that woud boot.
*I kindly request some guidance to a temporary manual fix.*
The mapper-ID (isw_****) seems to change from time to time. I don't know if 
that stems from the Ubuntu (Studio 14.04 LTS) installation or, possibly, from 
Intels RAID rebuild code that is launched via the Windows OS e.g. after power 
loss.
_____
blausand@Utopon ~> cat /proc/cmdline 
BOOT_IMAGE=/vmlinuz-3.2.0-67-generic 
root=UUID=57907805-da9f-4d85-9c49-71807a97c4c0 ro nosplash
blausand@Utopon ~> cat /proc/version
Linux version 3.2.0-67-generic (buildd@brownie) (gcc version 4.6.3 
(Ubuntu/Linaro 4.6.3-1ubuntu5) ) #101-Ubuntu SMP Tue Jul 15 17:46:11 UTC 2014

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https://bugs.launchpad.net/bugs/1358491

Title:
  [Trusty] fails to boot with kernels later than v3.11: systemd-
  udevd[133]: conflicting device node

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