To use multiseat-wizard-bicefalo on ubuntu x86-64 You need to replace 32-bit Xephyr by 64-bit Xephyr. You can download 64-bit version of Xephyr from first attachment or build it.

Building Xephyr for multiseat.

Install dependences: $ sudo apt-get build-dep xorg-server

Get sources: $ apt-get source xorg-server

Configure xorg server to build it only Xephyr with --enable-kdrive-evdev option: $ patch -p0 < patch (patch available in second attachment)

Build it: $ cd xorg-server-1.11.4 $ debian/rules binary

Replace old Xephyr by new: $ sudo cp build-main/hw/kdrive/ephyr/Xephyr /home/multiseat/