RAID configuration is not the only issue.  The install tool partman has
several design problems.  Each of the partitioning, RAID, LVM, and LUKS
/dm-crypt, and mkswap configuration functrions do not work well
together.  They behave as separate operations that get deadlocked when
used in patterns not anticipated by the designers.  The system needs to
allow the user to define the entire usage scheme, then validate it, then
apply it.  Then the tools need to figure out what order the partitions
are created, mounted as RAID and/or LVM and/or crypt volumes, then
continue installation.  Having the user looping through the modules
individually results in logical impasses.

I waste a lot of time fighting with the RAID system when I need to
adjust partition sizes and LVM physical volumes because md-raid is
already mounted and syncing.  There is no reason it needed to do that.
The RAID volume characteristics can already be calculated without
mounting it.

With my RAID/LVM/crypt setups I can never create an encrypted swap as it
fails every time.  I have to install without swap and add it manually
later.

-- 
Meta-bug:  Ubuntu needs major software RAID overhaul
https://bugs.launchpad.net/bugs/68308
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