By default you cannot receive files via Bluetooth on Ubuntu 10.10. It is strange that you can browse the paired Bluetooth devices from Ubuntu but you cannot receive files from a paired or any other Bluetooth device. In order to enable file sharing on Ubuntu you need to install Personal File Sharing software from Ubuntu software center. Go to Applications -> Software Center, and search for Personal File Sharing and install it. Ensure that you are connected to the internet.
- Software Center

- After Personal File Sharing software installation, click on Bluetooth icon and select Preferences.

- Now click on Receive Files button

- Select the Receive File check-box with a proper option - select Only for set up devices for paired devices or select Always for any Bluetooth device. Thats it.

- Send a file from a bluetooth device to the Ubuntu 10.10 desktop. Once it starts receiving the file, an additional icon will appear on your panel to indicate active file sharing process. And finally a dialog box will notify you that your bluetooth file has been recieved on Ubuntu. The file gets stored inside default Download folder.

