It won't format the whole disk immediately - you'll get a further confirmation message asking you whether you really want to apply the suggested changes.
** Changed in: ubiquity (Ubuntu) Sourcepackagename: ubiquity => partman-auto Status: Unconfirmed => Rejected -- Format whole disk is default with no warnings (edgy eft k2) https://launchpad.net/bugs/60847 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs