Hi. I bet that this question stems from your curiosity about an alternative operating system. If you're a home user, you'll be thoroughly dissapointed with what linux has to offer to you.
Upon installation of Ubuntu, you must have an internet connection, so that Linux can download proper media codecs. Without that, you cannot listen to music or watch movies. Linux has terrible preset screen-resolutions. In today's time, when we have resolutions much higher that 1024 X 768, Linux still supports that as the maximum. Plus, you won't be able to adjust your refresh-rate (monitor flicker rate) if you're using a CRT monitor. This'll hurt your eyes after ten minuted of usage. After you're tired of this initial glitch, you'll trawl linux forums searching for how to fix this. You'll be forced to mess with system files, change settings, which might result in total blackouts on reboots. Linux has no proper program installers. Everything is third party. Imagine, installing an application and not knowing where it is. Installers don't tell you where they install applications. They just go somewhere. If you happen to stumble upon the application somwhere on your system, you'll be able to run it. Otherwise, you can spend another hour on the legendary Linux forums.
Applications designed for Linux are buggy and second grade. I downloaded Audacity for Linux. After two hours of searching through linux forums, I found out where Audacity was installed. I had a horrible time configuring my microphone settings. At the end, I ended up uninstalling the application(after two more hours of searching how to uninstall applications). This is the procedure for any application. You'll have to search for an alternative, open source application that will match your reuirements. Hope that it comes with an installer(Yes. Some applications don't. So you have to compile the source code to install them. Imagine, compiling the source code of Yahoo Messenger just to install it). If you do a lot of webcam communication, Linux is useless. Yahoo messenger for Linux was last used by the dinosaurs. It doesn't even have voice chat. There's a messegner called AMSN, that allows video conferencing. But you'll have to spend two hours configuring your webcam. In the end, you'll end up uninstalling the application. Coming to your issue of gaming. If Solitaire and hangman is what satisfies your requirement, Linux is okay for you. Otherwise, don't even think about installing it. In short, Linux is not for home users, who just want to accomplish tasks like drafting an error-free letter (OpenOffice.Org is there, but the spell check is buggy. So is the grammar check), recording music, voice-chatting, connecting to a security enabled wifi network, etc. Linux is a killer of productivity, because most of a Linux user's time is spent on Linux formus asking other people how to accomplish simple tasks like installing a messenger (which windows can do inseconds), incidentally, the people on the forums don't have a clue, too. Linux can be used if you want to show off having another operating system, or are a geek who is ready to sacrifice productivity for appearing to be an expert at things that are not even important. Stay away from Linux.