Kubuntu 12 installer crashes at 64%

[Mirko Klasnja]

I am trying to install Kubuntu 12.04 AMD64 from Desktop CD.
At 64% there is a fatal error: grub-install cannot find /dev/sda
I am using Adaptec SCSI Raid controller ASC39320-R and have four disks in RAID0 configuration.
New disk, made by controller itself, is presented as "asr_STRIPE" and installation sees it as mapper/asr_STRIPE, but grub-install is looking for sda :-(

I tried alternate CD installation as well, but it stops at the begining with cyan screen and white stripe at bottom where I can type without any response.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.10.16 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu5
Architecture: amd64
CasperVersion: 1.315
Date: Sun Jul 1 22:13:04 2012
InstallCmdLine: file=/cdrom/preseed/kubuntu.seed FRONTEND_BACKGROUND=original boot=casper maybe-ubiquity initrd=/casper/initrd.lz quiet splash --
LiveMediaBuild: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120423)
ProcEnviron:
 LANGUAGE=
 TERM=xterm
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)