Okay let's sum this up.  This problem occurs:

May 19 10:10:16 richard-desktop kernel: [ 227.338011] device-mapper: table: 
254:1: linear: dm-linear: Device lookup failed
 May 19 10:10:16 richard-desktop kernel: [ 227.338017] device-mapper: ioctl: 
error adding target to table

People point to EVMS being installed but this is only causing the
problem to become visible, it's not the cause itself of the problem, and
removing it only hides the symptoms.

As stated before, I cannot map an unallocated part (not part of any
partition) of a disk anymore with dm-linear.  This has nothing to do
with EVMS at all, although it's exactly the same problem as being
experienced with EVMS.  The bug is located in the kernel!   In use
partitions should be locked, but why should a complete device be locked
if only certain parts of it are used?  This does not make sense.

** Changed in: linux-source-2.6.22 (Ubuntu)
       Status: Invalid => Confirmed

Device-mapper errors: dm-linear, lookup failed
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