How can I enable a face browser in LightDM?
Solution 1:
lightdm-webkit-greeter is under development with some packaging already being done for Ubuntu 11.10.
lightdm-webkit-greeter is a webkit themer for lightdm that allows distros and users to create themes.
There is a lightdm face browser theme proposal but everything is a bit far from final.
Best thing you can do at the moment if you are interested in having a face browser lightdm theme is really subscribe to the project and keep checking the progress being done.