Ubuntu – Can not properly install blender

I think its time to give up. I installed Ubuntu 12.04 two days ago. and wasted 36 hours on finding solution here at askubuntu and other forums, following them more than 4 times reinstalled Ubuntu but its such a waste , not because Ubuntu is not good, because there are so many different information here, so confusing for newbies like me. so thought it's time to get back to windows, still I want to try one more time, this time I again reinstalled a fresh Ubuntu and here is what I want.

I want to run blender 2.69.

what I have.
⠀i7 processor with 3gb
⠀nvidia Geforce 640 with 4gb ram

what I did so far.

tried many follow up here on askubuntu. got some response to my help call too. but they just keep quiet after a few answers and leave me in the middle of nowhere, then I have installed fresh and follow again different suggestion. the one I found very easy to follow is this tutorial but the installation of Nvidia worked and the installation of cuda failed, again I installed Ubuntu fresh one, and started second time this time the first step installation of Nvidia failed.
now its fresh installation of Ubuntu.

Thanks for your response.

I have cuda 5, I dont know when I try to download there was more than one type
Ubuntu 12.04 DEB** RUN DEB** RUN DEB

I just choose RUN.

I want blender to use my Nvidia graphics card for better performance, once I installed blender and it was working but in preference > system I did not find GPU or my Nvidia option, it was just CPU, so I removed it,
for the link you provided I did not try that but I will try it and get back to you, if I can have your Skype would be nice, I will only bother you till my computer is up and running again properly with blender, 🙂 thanks.
the link provided to download blender at the page on your given link does not exist, but I will download it from the main side if it's OK.

I followed your step at the provided link, but…

…it's not clear how to open blender application, anyway I went to the folder containing blender and clicked on blender.exe and found this error message:

Archive:  /home/shams/blender/blender.exe
[/home/shams/blender/blender.exe]
  End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
zipinfo:  cannot find zipfile directory in one of /home/shams/blender/blender.exe

…or /home/shams/blender/blender.exe.zip and cannot find /home/shams/blender/blender.exe.ZIP period.

and when I try to run from the terminal

shams@ubuntu:~$ sudo cp ~/blender /usr/lib/blender -r
[sudo] password for shams: 
shams@ubuntu:~$ blender
The program 'blender' is currently not installed.  You can install it by typing:
sudo apt-get install blender
shams@ubuntu:~$ 

…so, should I use sudo apt-get install blender?

These are links to my screenshots from Blender and Additional Drivers:
⠀http://grab.by/s3K8
⠀http://grab.by/s3K0
⠀http://grab.by/s3K4
⠀http://grab.by/s3ME
⠀http://grab.by/s3N6

I have a new issue with my Nvidia GeeForce 640 on i7 processor
can somebody help please.
Thanks

here are some ouptu

shams@ubuntu:~$ /usr/lib/nux/unity_support_test -p
Xlib: extension "GLX" missing on display ":0.0".
Error: GLX is not available on the system
shams@ubuntu:~$ lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation Device 0fc1 (rev a1)
shams@ubuntu:~$