ubuntu fails to install - fedora7 already installed, with spearate /boot partition

[slang]

Binary package hint: ubiquity

I currently work on fedora7 and want to dual boot it with ubuntu 8.10. Eventually Im looking to use ubuntu, but I want a fallback to my stable fedora7.

Towards the end of install process it fails. I think it maybe due to the fact I have a separate /boot partition.
Ive tested installing ubuntu when the existing fedora7 has /boot under the root partition and that works fine - dual boots ubuntu and fedora.

The disk layout is
[root@homer ~]# fdisk -l

Disk /dev/sda: 250.0 GB, 250058268160 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux /boot for fedora
/dev/sda2 14 2563 20482875 83 Linux root for ubuntu
/dev/sda3 2564 5113 20482875 83 Linux root for fedora
/dev/sda4 5114 30401 203125860 5 Extended
/dev/sda5 5114 11487 51199123+ 83 Linux
/dev/sda6 11488 17861 51199123+ 83 Linux
/dev/sda7 17862 24235 51199123+ 83 Linux
/dev/sda8 24236 24496 2096451 82 Linux swap / Solaris
/dev/sda9 24497 30401 47431881 83 Linux

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 8.10
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InterpreterPath: /usr/bin/python2.5
Package: ubiquity 1.10.10
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity --only
ProcEnviron:
 LANGUAGE=
 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 LANG=en_US.UTF-8
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', '--only']
SourcePackage: ubiquity
Title: ubiquity crashed with InstallStepError in configure_ma()
Uname: Linux 2.6.27-7-generic i686
UserGroups: