Installing and Uninstalling ubuntu kernel

Steps for installing ubuntu kernel 

• Get the source code  

          apt-get source linux-image-$(uname -r)

• Perform this step only for the first time you build kernel.

          Downloading dependencies

          sudo apt-get build-dep linux-image-$(uname -r)

• Building kernel 
Now move inside the downloaded kernel directory and type following commands.

fakeroot debian/rules clean
fakeroot debian/rules binary-headers binary-generic

After this step, 3 files with .deb extension would be generated in the parent directory of your current folder. Install them using this command

•  sudo dpkg -i linux*2.6.38-7.37*.deb

•  Now reboot. After rebooting you can do uname -r to check whether you have booted into new kernel.  

Steps for uninstalling ubuntu kernel   

• Open the Synaptic package manager. If its not present you can at first install it.
• Now check your current kernel version using uname -r . Or just make a note of the kernel version which you want to remove.
• Now inside Synaptic package manager you will find "search". Inside that type 'linux-image'. 
• After that you will see different kernel images which are installed in your pc.
• Now select the one which you want to remove and mark it for removal.
• After that apply the changes to remove that kernel version.