As Paul said. I'm afraid there isn't much the installer can sanely do against critical bits of itself like debconf suddenly failing, as at that point it might even be unable to display error messages ...
** Changed in: ubiquity (Ubuntu) Status: Unconfirmed => Rejected -- zlib_fs returned unexpected result 0xfffffffd https://launchpad.net/bugs/66505 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs