install linuxmint 17.2 or Ubuntu 14.04.3 any flavor 64 bit, I tested on Linuxmint xfce and Xubuntu
for mint click on the shield in the lower right corner and update everything
for Ubuntu first time you boot it will want to update do it

IMPORTANT NOTE DO NOT UPGRADE YOUR SYSTEM JUST UPDATES FOR NOW AND FUTURE

# copy setupRt.sh to your home directory
# in a terminal

chmod +x setupRt.sh
sudo ./setupRt.sh

# While script runs it will come to a point and hangs for a bit all is well just wait
# Message in terminal will be:

Error! Bad return status for module build on kernel: 3.2.0-0.bpo.4-rt-amd64 (x86_64)
Consult /var/lib/dkms/ndiswrapper/1.59/build/make.log for more information.

Near end of script Grub Customizer will open
Deciding on a default boot kernel
Now click the "General Setting" tab 
Click on choice box to the right of predefined 
In drop down menu choose 3.2.0-0.bpo.4-rt-amd64 for default system boot
Making sure you do not choose (recovery mode) option for your kernel

Razor_Keen; in the box for Kernel Parameters on your Dell laptop enter:

quiet splash lapic noxsave -original paramters- intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll

Now click Save, make sure to wait until save has finished.
   You want to be able to boot into 3.2.0-0.bpo.4-rt-amd64 kernel without having to choose
   and/or to avoid the use of Advanced option for every start-up
When you close Grub Customizer your computer will reboot then re-open this file and continue

# in a terminal

uname -r

# should print out: 3.2.0-0.bpo.4-rt-amd64 this is the Rt-preempt kernel all is well so far.

# Clone Linuxcnc in a terminal

git clone git://git.linuxcnc.org/git/linuxcnc.git emc
cd emc 

# To list all the branches in your local repository

git branch -r

# To set focus to 2.7 for build (for other than Master 2.8) if this is not done you will build 2.8

git checkout -b 2.7 origin/2.7

# To build deb's for 2.7 this will take a while:

debian/configure uspace ; debuild -d -uc -us > configure.txt

# Install the deb's with gdebi any missing dependencies will also be installed from internet:

cd ..
sudo gdebi -n linuxcnc-uspace_2.7.3_amd64.deb
sudo gdebi -n linuxcnc-doc-en_2.7.3_all.deb

# NOTE DEB FILES WILL ONLY WORK FOR OS AND FLAVOR THEY WERE MADE ON
# DEPENDANCICES SCRIPT FILE INSTALLS STILL HAVE TO BE INSTALLED FIRST

# Menu items for linuxcnc are in Start Menu-->CNC
# You now have the newest stable build of linuxcnc 2.7.3
 Run latency-test for about a hour
and open in terminal
glxgears

and play some music
and move some large files around on harddrive
Doing so while running latenc-test is a good test

# the clone of git, directory emc can now be deleted if desired

# helpful links
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?The_Isolcpus_Boot_Parameter_And_GRUB2
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?RealTime