sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-key adv --keyserver hkp://keys.gnupg.net --recv-key 3cb9fd148f374fef
sudo add-apt-repository "deb http://linuxcnc.org/ precise base 2.7-rtai"
sudo apt-get update
sudo apt-get -y install linux-image-3.4-9-rtai-686-pae rtai-modules-3.4-9-rtai-686-pae
sudo apt-get -y install linux-headers-3.4-9-rtai-686-pae
reboot and hold the left shift key down to get to the boot menu
select advanced options and pick the 3.4-9-rtai-686-pae kernel
uname -r
should report 3.4-9-rtai-686-pae
git clone git://git.linuxcnc.org/git/linuxcnc.git lcnc
sudo apt-get install -y devscripts build-essential
sudo apt-get install -y imagemagick texlive-font-utils tcl8.6-dev tk8.6-dev
sudo apt-get install -y libxaw7-dev libncurses-dev libreadline-gplv2-dev
sudo apt-get install -y dblatex groff python-dev python-tk libglu1-mesa-dev
sudo apt-get install -y libgtk2.0-dev asciidoc source-highlight 
sudo apt-get install -y libboost-python-dev texlive-lang-cyrillic debhelper
sudo apt-get install -y texlive-lang-french texlive-lang-spanish
sudo apt-get install -y texlive-lang-german libmodbus-dev dvipng
sudo apt-get install -y libusb-1.0-0-dev graphviz inkscape python-numpy
sudo apt-get install -y python-imaging-tk python-gtkglext1 tclreadline blt
sudo apt-get install -y bwidget libtk-img tclx
cd lcnc
git checkout -b 2.7 origin/2.7
debian/configure -r ; debuild -uc -us
cd ..
sudo dpkg -i linuxcnc_2.7.4_i386.deb
sudo dpkg -i linuxcnc-doc-en_2.7.4_all.deb