grub install fails. installing from /dev/sda to /dev/sdb

Exception during installation:
Apr 18 15:12:54 ubuntu plugininstall.py: Traceback (most recent call last):
Apr 18 15:12:54 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1720, in <module>
Apr 18 15:12:54 ubuntu plugininstall.py: install.run()
Apr 18 15:12:54 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Apr 18 15:12:54 ubuntu plugininstall.py: func(self)
Apr 18 15:12:54 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 204, in run
Apr 18 15:12:54 ubuntu plugininstall.py: self.configure_bootloader()
Apr 18 15:12:54 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 998, in configure_bootloader
Apr 18 15:12:54 ubuntu plugininstall.py: "GrubInstaller failed with code %d" % ret)
Apr 18 15:12:54 ubuntu plugininstall.py: InstallStepError: GrubInstaller failed with code 1
Apr 18 15:12:54 ubuntu plugininstall.py:

Exception during installation:
Apr 18 15:40:04 ubuntu plugininstall.py: Traceback (most recent call last):
Apr 18 15:40:04 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1720, in <module>
Apr 18 15:40:04 ubuntu plugininstall.py: install.run()
Apr 18 15:40:04 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Apr 18 15:40:04 ubuntu plugininstall.py: func(self)
Apr 18 15:40:04 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 204, in run
Apr 18 15:40:04 ubuntu plugininstall.py: self.configure_bootloader()
Apr 18 15:40:04 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 998, in configure_bootloader
Apr 18 15:40:04 ubuntu plugininstall.py: "GrubInstaller failed with code %d" % ret)
Apr 18 15:40:04 ubuntu plugininstall.py: InstallStepError: GrubInstaller failed with code 1
Apr 18 15:40:04 ubuntu plugininstall.py:

This bug was fixed in the package ubiquity - 2.10.14

---------------
ubiquity (2.10.14) precise-proposed; urgency=low

  [ Colin Watson ]
  * Install ubiquity-frontend-$frontend along with oem-config-$frontend to
    improve dependency resolution; with the packaging the way it is at the
    moment, apt may sometimes select ubiquity-frontend-kde to resolve
    ubiquity's dependency on a frontend before realising that oem-config-gtk
    already depends on ubiquity-frontend-gtk.
  * Don't default to installing GRUB to a removable device with /cdrom
    mounted from it, even if /cdrom's filesystem isn't iso9660
    (LP: #984989).
  * If encrypting the user's home directory, wipe and enable encrypted swap
    before starting the slideshow, because running the slideshow can use up
    a lot of memory so we won't be able to disable swap once that's in
    progress (LP: #979350).
  * Automatic update of included source packages: apt-setup 1:0.55ubuntu3,
    partman-base 153ubuntu4, user-setup 1.42ubuntu3.
  * If /etc/network/interfaces doesn't exist when configuring the network in
    oem-config, write out a skeleton one (LP: #985305).

  [ Stéphane Graber ]
  * Always install oem-config-slideshow-ubuntu in OEM mode, also for
    alternate installs (LP: #984736)
 -- Colin Watson <email address hidden> Thu, 19 Apr 2012 03:30:44 +0100

It would also be nice if the alternate (txt) installer would allow the user to select which drive to install grub to.
Its frustrating that it always assumes sda.
I've got a single ide drive which "oscillates" between sde and sda.
I've also got a 4 drive raid 5 array.

Ubuntu seems to love to install grub to sda when its part of my raid array potentially screwing up the array and leaving my system unbootable. On a fresh install...