Installer crashed after few failed attempts to install grub on software raid0 and "continue without bootloader"

[Alexey Ozerov]

My installation steps:
1) Create software raid0 md0 for "/" and md1 for swap on two SSDs
2) Run installer "Try unbuntu -> Install"
3) At the end of installation I have the error, that grub cant't be installed on /dev/sda1 (actually, known issue)
4) There is menu to choose another location to install I've tried md0 and md0p1 locations (of course unsuccesful) but after second attemp I've got the pop up message "Installation complete: continue/reboot" and "Failed to install grub to /dev/md0p1" in a few seconds.
5) I've pressed "Continue without bootloader" to install it manually and pressed "Continue to use" in another pop up window.
6) Crash.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.18.7
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CasperVersion: 1.340
Date: Sun Apr 20 18:07:36 2014
InstallCmdLine: noprompt cdrom-detect/try-usb=true file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.