I fixed this in ubiquity 1.0.13 and 1.1.1 as part of the fix for bug 48856.
** Changed in: ubiquity (Ubuntu) Assignee: (unassigned) => Colin Watson Status: Confirmed => Fix Released -- ubiquity sometimes doesn't pass correct window ID to gparted --installer https://launchpad.net/bugs/47652 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs