How-To: Install Ubuntu and Linux Apps on Your PlayStation 3
Once the emulator finishes setting up, close the terminal and locate the launcher in 'Applications' → 'Games' → 'Snes9express.' Open up the software and immediately find the 'Controllers' tab. Whatever you do, don't ever configure the Sixaxis or Dualshock to a different set of buttons, that will lead to Ubuntu SNES disaster. All you need to do is select 'Devices' on the right, and then enter the following line beside Pad1 in replacement of the existing data: /dev/input/js0

Go ahead and hit 'Close.'
Now find the 'Sound' tab. Ensure a box is checked next to 'sound,' 'stereo,' 'filters,' and 'thread sound.'

Click the video tab. Here, place a check next to 'scale,' 'high-res,' and 'full screen.' Don't worry about any of the other options

Now go to the 'ROM' tab, click the folder icon near the far right-hand side of the screen, and locate your SNES ROM files

Select the title you wish to play, and then after the directory string is listed in the text box, click 'Power' to start the game. If anything goes wrong, or if you mistakingly tried to finagle your controller to a different scheme, just click the 'Reset' button to undo your custom settings.

VLC Player
VLC is an extremely flexible and stable jack‐of‐all‐trades media player that allows you to view all of your (legally) downloaded movies and personally created film strips. It even covers the often elusive MP4 format as well. It's easy to utilize, but it's rich in functionality. Grab it by reading below.
Open up a terminal and type the following, pressing enter afterwords:
sudo apt-get update
Now, on the next line, type this next string, hitting enter at the end:
sudo apt-get install vlc vlc-plugin-esd mozilla-plugin-vlc
Let the process complete, and then close the terminal. Now go to 'Applications' → 'Sound and Video' → 'VLC Media Player.' When first launched, choose your downloaded album art preference (default to manual download only) and then continue to finish the setup.

To play movies, find the 'Media' tab and then click 'Open File.'

Now use the drop-down menu to search for your movies. When you've found one, just click 'Play,' and VLC will begin your video.
And that's all there is to it. Enjoy!

Ubuntu vs. Xubuntu
While the titles of Ubuntu and Xubuntu are differentiated by a single letter, in reality, these two Linux distros have a few notable differences. Basically, Xubuntu is lighter resource-wise, and some have noted better performance on the PS3 due to the console's rather limited memory bandwidth. But the biggest gap between the two platforms is the window wrapper that runs them (Xubuntu gets its fuel from XFCE, where Ubuntu cruises on raw uncut Gnome). Gnome goes for a cleaner look and a more sparse desktop approach, catered more for the typical user. XFCE shoots more for the higher-end minutia detail-driven crowd.
But it's important to note that while Xubuntu can be a more nimble contender in the modifying and resource arena, Ubuntu enjoys a powerful uppercut with an overall larger application diversity base and a simpler directory experience. Really though, all said and done, it just comes down to personal taste and preference, as many of the big apps like VLC, Skype, etc. are easily attainable for either OS. You can always redo the installation steps at the beginning of this article if you wish to wipe out one for the other on your PS3, so feel free to experiment with both!