If you are looking for quick transfer of files between two Ubuntu systems within the same network, it can get no easier . Just follow the steps
1. Install Giver on both systems. (Available from Ubuntu Software Centre)
2. Launch the program on both systems. You will see the program will automatically detect and list all available ubuntu machines in the network.
3. Right -click on the user from the list of users whom you want to share a file with. It will pop up options to share a folder or a file.
4. Accept the share in the other computer.
That’s it! Sharing a folder or a file is just so easy in Ubuntu