The fact that gksu does not support alternative means of authentication has nothing to do with this regression in sudo. Relevant bug for that issue is #86843. The solution is to use gksu-polkit, a successor to gksu, instead.
** Changed in: gksu Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/609645 Title: [Maverick regression] Fingerprint authentication (libpam-thinkfinger, libpam-fprint & libpam-fprintd) not working with basic sudo -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs