On a Lenovo Thinkpad the trackpad is the red button that acts as a mouse. To set the sensistivity and speed of your trackpad on for ubuntu/debian linux do (as root):
echo -n 180 > /sys/devices/platform/i8042/serio1/speed
echo -n 250 > /sys/devices/platform/i8042/serio1/sensitivity
To have these applied every time you user the computer (probably what you want!) just add those two lines to /etc/rc.local before the final exit 0 so results looks like:
echo -n 180 > /sys/devices/platform/i8042/serio1/speed
echo -n 250 > /sys/devices/platform/i8042/serio1/sensitivity
exit 0