Sharing Files between Ubuntu machines (even Windows) is super simple.
- Right click any folder you want to share and select Sharing Options
- Select Share this Folder
- If you are prompted with 'Sharing service is not installed' select Install service
- Authenticate with your password
- When prompted Restart your session
It's that easy! Now you can share files between other computers on the network!
To access files on other computers go to:Places>Network
and choose the computer you want to access!