I talked to Evan, a proper fix is in the making.
The fix will appear in Daily ISOs in coming days, this means that you will need to use a new version of Wubi with a new ISO (both will become the "default" in July when 8.04.1 is released). I will let you know once everything is ready.
For the impatients, you may want to edit C:\ubuntu\install\custom-installation\preseed.cfg so that it looks like:
Code:
d-i anna/choose_modules multiselect migration-assistant
d-i migration-assistant/partitions multiselect
d-i migration-assistant/MADEVICE/users multiselect hostuser
d-i migration-assistant/MADEVICE/hostuser/items multiselect AIM Triton, Internet Explorer, Yahoo, MSN, Opera, Firefox, Wallpaper, User Picture, Outlook Express, Gaim
d-i migration-assistant/MADEVICE/hostuser/user string linuser
Basically in the second line above after multiselect you need a few whitespaces and nothing else (which should mean: we do not select any partition!). Thanks to Evand for the tip!
Apologies for the troubles.
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