This happened to me too yesterday. I don't recall any warning messages just a greyed out format box. I did see it but I thought I will be asked before proceeding. Older versions of ubuntu installers always used to ask for confirmation. Where did that go?
I lost about 200GB irreplaceable data and NO BACKUP. I'm devastated... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/579866 Title: 10.04 and 10.10 Install formatted ext3 partition (data lost) To manage notifications about this bug go to: https://bugs.launchpad.net/ubiquity/+bug/579866/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs