Ubuntu Partitions (Installation)

Start the installation and select manual installation in Step3. Follow the steps below in Step4

Swap - 512MB (approx)

ext2 - / - 4068 - 10240MB (approx depending on your requirement)

ext3 - /home (Your wish)


Some Comments:
Swap is like temporary memory like the page file in windows it used for implementation of virtual memory technique i think so.....

/ is the root directory which holds everything.....

/home is where your user profile would be created it's like the Storage of program files and whatever u download or create is held here... it has been separated out from the root so that while u partition the drive for a new installation u don't loose the program configurations or your downloaded files........ there is no other specific reason for the /home to be separated out from the root