The MG5200 has built in wireless networking. You can connect it to your wireless router through the settings in the printer's control panel / LCD screen. I'm not sure mine even has an ethernet port (it's 3 floors down and I'm too lazy to go look).
I've never used my MG5200 with any of my computers (Ubuntu 10.10 and Win7) other than over the wireless network. You may want to assign it a static IP. I did, not sure if letting it use DHCP could/would cause any issues.
I doubt that you'll need to uninstall the driver. For Ubuntu, just try System->Administration->Printing. Click the Add button. Expand the Network Printer option on the left and wait a few (1-10) seconds. It should refresh and show the Canon-MG5200-series_xx-xx-xx-xx-xx-xx. Select that printer, click Forward, it should search for and find the driver.
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