how to save and back up all of your packages on ubuntu to reinstall them later on the same or other computer

how to save and back up all of your packages on ubuntu to reinstall them later on the same or other computer

i know ! it is so useful to save your packages that you have installed on your ubuntu .
well lets start ! .....



WHY ? 
well alot of people know why .
but really ! do you have every time you install ubuntu on your computer or someones to update all your packages and re install all of your program and take every thing back ?
it is like 400 mb of download !
so you have to wait "specially if you have slow connection" and install .
and then you must install ubuntu on a computer with internet connection or else it will be kinda useless!
and specially that it is not normal to see someone sell ubuntu packages CDs !
so now ....
HOW ?
well i got this from ubuntuforums.org  you need to use command line "terminal" .
to open terminal simply click on Applications>Accessories>terminal
OR :
click Alt-F2 and enter "gnome-terminal" then click run ! .
now copy the following codes

 sudo apt-get install dpkg-repack fakeroot

 mkdir ~/dpkg-repack; cd ~/dpkg-repack

 fakeroot -u dpkg-repack `dpkg --get-selections | grep install | cut -f1`

the last one will take some time .
and you need like 2GB free space in your /home/$USER/ .
now after finishing go to your home directory and you will see a folder called "dpkg-repack" inside of it you will find all of the packages!

- how to install them when i need them ? 

simply put the folder "dpkg-repack" in your home directory and open terminal then copy / past those commands :

cd /home/$USER/dpkg-repack/

sudo dpkg -i *.deb 

P.S : if you have renamed the folder that have the packages just simply replace the folder name here just like this :

cd /home/$USER/FOLDERNAME/

and continue ....

insert the password and wait until installing .


when done restart your computer and here you go! every thing is back !

 memo

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