I have a Acer Aspire V5-552G laptop that comes with two AMD graphics cards(APU + a dedicated one). I have installed the proprietary fglrx-updates drivers, but the drivers are old. They don't even include the switch graphics option to switch between the two graphics cards. What can I do to get the new amd omega drivers?
I don't know how old your Ubuntu installation is, but in just this past year, Ubuntu has radically changed how it handles device drivers, and things have gotten SO GOOD I've taken to uninstalling the proprietary drivers I'd installed, as now Ubuntu often runs my graphics better this way. I recommend you try uninstalling your AMD drivers (either by command line or using the Synaptic Package Manager), and then if things don't improve, then returning to the System Settings, "additional drivers" icon to load new AMD drivers.
Before posting this "answer" I bothered to look up your laptop and it seems that some or all of that model had a touch screen. I have Ubuntu on a rather old and heavy tablet and it operates it just fine without having installed any special drivers.
Please clarify what functionality you aren't seeing. As for switching between the two monitors, that's handled in the System Settings under "Displays".