Hello, i have the same problem. The install failed with the same error.
Tested on a HP DL360 G4 (2 disk in HW raid1(smart array 6i integrated raid) + 3 disk in HW raid5 (smart array 6i integrated raid) + 13 FC Disks in one expansion rack (Logical RAID 5). In expert mode, the install failed. But, in "automatic" installation, there is no problems (but not installed in the good place for me).
I've tested with the 32bit version but the install fails too (in expert mode).
Finally, i've installed ubuntu 64 bit server and after install zentyal packages with no problems.
regards,
David