Thanks for your report. I confirmed it on Oneiric
Issue looks like bug 830895 with a similar message in the logs:
(ubiquity:4845): Gtk-WARNING **: Unable to show '': Operation not supported
** Changed in: ubiquity (Ubuntu)
Importance: Undecided => High
** Changed in: ubiquity (Ubuntu)
Status: New => Confirmed
** Also affects: ubiquity (Ubuntu Oneiric)
Importance: High
Status: Confirmed
** Changed in: ubiquity (Ubuntu Oneiric)
Assignee: (unassigned) => Ubuntu Installer Team (ubuntu-installer)
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https://bugs.launchpad.net/bugs/852054
Title:
During installation process: Clicking "advanced partitioning tool"
won't open partitioning tool
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