Black screen on boot after installing ati drivers

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http://askubuntu.com – System: Xubuntu 12.10 x86 I installed the Ati drivers using the Software Center, everything apparently whent fine (no error messages). After rebooting the system i get a black screen. The system responds to input (if i press the power down button it closes gracefully) but is completely unusable. From the boot menu i can decide to load the root terminal, but i have no idea of what to do in order to remove the drivers. Following some guides i looked for: the Xorg.conf file in /etc/X11 /usr/share/fglrx/fglrx-uninstall.sh /usr/share/ati/fglrx-uninstall.sh But they were all missing. What ste (HowTos)