I agree with Carthik; this is also bug 47046. However, since you're
trying to upgrade an existing installation, using the installer is
inappropriate. You'll need to rescue the situation using the upgrade
tools.
** Changed in: ubiquity (Ubuntu)
Status: Needs Info => Rejected
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Problems up
Could you please attach /var/log/installer/syslog, /var/log/syslog, and
/var/log/partman to this bug, using the "Add Attachment" link on the
bug's web page? Thanks in advance.
Note: The issue is probably that reported in Bug #47046 which has been
fixed for Edgy already, where you need to reformat
