Ubuntu doesn't boot normally after manual installing of X.org

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http://unix.stackexchange.com – I tried to compile and install X.org (for a single card/multiseat in this tutorial) by getting source from here and installing it by: ./configure --enable-kdrive --enable-xephyr --enable-xfake --enable-xfbdev --enable-kdrive-kbd --enable-kdrive-mouse --enable-kdrive-evdev --enable-glx-tls make sudo make install after this Ubuntu freezes in boot on the Ubuntu logo and doesn't boot up! Note: it boots in recovery mode and X starts by using startx from terminal (in recovery mode) ; it just doesn't start normally! I'm using Ubuntu 12.04 What is the problem? How can I fix it? (HowTos)