just know the following commands for initial phase:
open your terminal by going : Applications->Accessories->Terminal
and type the command you want .. ...
1. after you install your ubuntu update it using the command : sudo apt-get update
2. to search any packages just type the command : sudo apt-cache search package name
*package name like what you want to search just give the name.
3. to install the packages you search type : sudo apt-get install package name
* package name you got from search command.
4. to remove the package : sudo apt-get remove package name
i will post you other command keep in touch............