Refer to:https://help.ubuntu.com/community/How%20to%20install%20Ubuntu%20on%20MacBook%20using%20USB%20Stick

hdiutil convert -format UDRW -o ubuntu-12.10-desktop-amd64+mac.img ubuntu-12.10-desktop-amd64+mac.iso 
sudo dd bs=1m if=ubuntu-12.10-desktop-amd64+mac.img.dmg of=/dev/disk2

Refer to:http://uselessuseofcat.com/?p=74

Section "InputClass"
    Identifier         "Touchpad"
    Driver             "synaptics"
    MatchIsTouchpad    "on"
    Option         "ClickFinger3" "2"
    Option         "HorizTwoFingerScroll" "1"
    Option         "VertScrollDelta" "85"
    Option         "HorizScrollDelta" "85"
    Option         "TapButton1" "1"
    Option         "TapButton2" "2"
    Option         "TapButton3" "3"
    Option         "TapAndDragGesture" "off"
    Option         "FingerHigh" "50"
#    Option         "FingerLow" "10"
    Option         "RTCornerButton" "0"
    Option         "RBCornerButton" "0"
    Option         "LTCornerButton" "0"
    Option         "LBCornerButton" "0"
    Option         "PalmDetect" "on"
    Option         "MinSpeed" "0.5"
    Option         "MaxSpeed" "1.5"

EndSection

# These settings were set by the catalyst build script that automatically
# built this stage.
# Please consult /usr/share/portage/config/make.conf.example for a more
# detailed example.
MAKEOPTS="-j5"
CFLAGS="-O2 -march=native -pipe"
CXXFLAGS="${CFLAGS}"
# WARNING: Changing your CHOST is not something that should be done lightly.
# Please consult http://www.gentoo.org/doc/en/change-chost.xml before changing.
CHOST="x86_64-pc-linux-gnu"
GENTOO_MIRRORS="http://mirrors.163.com/gentoo"
SYNC="rsync://mirrors.163.com/gentoo-portage"
USE="nptl nptlonly -ipv6 -fortran unicode svg hal dbus -kde -qt4 -arts -eds -esd gnome gstreamer gtk firefox X cups introspection cjk"
CCACHE_DIR="/var/tmp/ccache"
CCACHE_ZIE="2G"
INPUT_DEVICES="evdev synaptics mouse keyboard joystick"
VIDEO_CARDS="radeon intel vesa fbdev fglrx"
ALSA_CARDS="hda-intel"
LINGUAS="en zh_CN"
source /var/lib/layman/make.conf