graphical / visual disk map

https://apps.ubuntu.com/cat/applications/oneiric/gdmap/

CUDA 5.5 on optimus laptop with ubuntu 12.04 LTS

Install a pristine Ubunto distro (check tutorials)

Get make and gcc

4 sudo apt-get install build-essential

Check version

7 gcc –version

Check nvidia card present

8 lspci | grep -i nvidia

Stop X server

9 sudo service kdm stop

Remove current nvidia drivers

19 sudo apt-get --purge remove nvidia-current

Get xorg tools

20 sudo apt-add-repository ppa:xorg-edgers/ppa

21 sudo apt-get update

Get bumblebee

22 sudo apt-get install bumblebee-nvidia nvidia-319 nvidia-settings-319

23 sudo apt-add-repository ppa:bumblebee/stable

24 sudo apt-get update

25 sudo apt-get install bumblebee virtualgl linux-headers-generic

Remove nvidia-current which came with bumblebee

28 sudo apt-get --purge remove nvidia-current

Install nvidia-319 (automatically gave me 325 after all...)

29 sudo apt-get install nvidia-319 nividia-settings-319

Modify /etc/bumblebee/bumblebee.conf to replace “nvidia-current” with “nvidia-325”

sudo nano /etc/bumblebee/bumblebee.conf

Make changes valid

36 sudo reboot

Check success:

40 optirun nvidia-settings -c :8

41 locate xorg.conf

Install CUDA toolkit

43 sudo service kdm stop

44 cd Downloads/

45 l

Here, tell cuda NOT to install the driver

46 sudo sh cuda_5.5.22_linux_64.run

Add paths to .bashrc

48 nano .bashrc

Validate:

49 sudo reboot

Check how it works (did not install OpenGL et al., I dont use them)

50 cd NVIDIA_CUDA-5.5_Samples/

54 cd 1_Utilities/

56 cd deviceQuery

58 make

64 optirun ./deviceQuery

How to change the default GCC compiler in Ubuntu?

As @Tommy suggested, you should use update-alternatives.
It assigns values to every software of a family, so that it defines the order in which the applications will be called.
It is used to maintain different versions of the same software on a system. In your case, you will be able to use several declinations of gcc, and one will be favoured.
To figure out the current priorities of gcc, type in the command pointed out by @tripleee's comment:

update-alternatives --query gcc

Now, note the priority attributed to gcc-4.4 because you'll need to give a higher one to gcc-3.3.
To set your alternatives, you should have something like this (assuming you gcc installation is located at /usr/bin/gcc-3.3, and gcc-4.4's priority is less than 50):

update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-3.3 50

--edit--
Finally, you can also use the interactive interface of update-alternatives to easily switch between versions. Type update-alternatives --config gcc to be asked to choose the gcc version you want to use among those installed.
--edit 2 --
Now, to fix the CXX environment variable systemwide, you need to put the line indicated by @DipSwitch's in your .bashrc file (this will apply the change only for your user, which is safer in my opinion):

echo 'export CXX=/usr/bin/gcc-3.3' >> ~/.bashrc

http://stackoverflow.com/questions/7832892/how-to-change-the-default-gcc-compiler-in-ubuntu 

Brother printer on Ubuntu Linux

Brother support page
http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/evaluation.html

for HL-2240D you need "Printer Driver (lpr driver and cupswrapper driver)"

Lpr driver instructions
http://welcome.solutions.brother.com/bsc/public_s/id/linux/en/instruction_prn3.html

- complete prerequisites
- install
-configure

Dual boot - Win 8 does not boot after unsuccessful EasyBCD run

If the Windows partition is still intact, but the bootloader is confused, do the following:

- acquire the CD or USB stick with Win 8 recovery tools, any Win 8 PC can create one, but the machine must be 32-bit or 64-bit like the "broken" one.

- boot from this media drive (maybe you need to modify bios boot priority first)

- reach the command prompt

- execute : bootrec /rebuildbcd

-The program will conclude if it finds an installed windows partition. Follow instructions in the prompt.

http://superuser.com/questions/451277/missing-boot-files-in-windows-8

Unix: move odd or even numbered files

$ mkdir odd; mv *[13579].fileextension odd

Source: http://superuser.com/questions/587495/osx-unix-move-odd-or-even-numbered-files