Upon further testing with scenarios with permutations on the following:

- installation to disks involving one or two controllers
- inclusion of LVM
- inclusion of MD (software RAID)

my hypothesis is that the installer is simply getting confused by the
dual controllers.

Some observations:

a) When installing to disk involving one or both controllers and a
combination of LVM and MD then package installation fails.

b) When installing to disk involving both controllers and no LVM nor MD
then package installation succeeds but the system does not boot (which I
presume is because GRUB installation failed).

c) When installing to disk involving a single controller (2 test
installs; RAID 0 and RAID 6) and no LVM nor MD then both package and
GRUB installation succeeds.  Still, the installer detects controllers in
wrong order and complains.

I am working on getting the partman & syslog installer logs to the last
scenario.

Other info:

The PCI ids for the controllers

03:00.0 RAID bus controller [0104]: Hewlett-Packard Company Smart Array G6 
controllers [103c:323a] (rev 01)
        Subsystem: Hewlett-Packard Company Device [103c:3245]

0c:00.0 RAID bus controller [0104]: Hewlett-Packard Company Smart Array G6 
controllers [103c:323a] (rev 01)
        Subsystem: Hewlett-Packard Company Device [103c:3243]

** Summary changed:

- Cannot install - unable to execute installed post-installation script: 
Permission denied
+ Cannot install on HP Proliant DL385 G7 - dual RAID controllers

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https://bugs.launchpad.net/bugs/695842

Title:
  Cannot install on HP Proliant DL385 G7 - dual RAID controllers

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