Partitioning fails in installer

[Jarno Suni]

Binary package hint: ubiquity

I chose install in the initial menu of Xubuntu desktop cd dated 2010-04-27.
I chose manual partitoning, did some editing, but got errors after finally chose Install.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: ubiquity 2.2.23
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
Architecture: i386
Date: Wed Apr 28 13:55:49 2010
LiveMediaBuild: Xubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100427)
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity

[Jarno Suni (jarnos)]

If I choose Go Back instead of Continue, the Prepare partitions dialog is brought back, but installation continues without user action; at least a dialog that is displayed on top shows progress.

[Jarno Suni (jarnos)]

If I did what is said in #8, after installation is finished, control remains in Prepare partitions dialog, but if I reboot by SysRq-s SysRq-u SysRq-b, I can boot the new OS from hard disk.