How-To: Install Ubuntu and Linux Apps on Your PlayStation 3
After the system has scanned the ISO, highlight and select 'Start.' The PS3 will pre-scan the Ubuntu installation, but it won't actually launch it. To do that, you'll need to got to 'Settings'→'System Settings' → 'Default System.'

Change the default setting of 'PS3' to 'Other OS.' Select 'Restart,' when prompted. The PlayStation 3 will turn off for a few seconds and then reboot. Don't panic: when the system restarts there might be a small delay until you start seeing the Linux gears turn.
Let the data compile until the final line eventually ends with 'Kboot,' and a nice friendly blinking cursor.
If at any time the install gets stuck, or if your overweight cat accidentally stumbles over the PS3's power cord killing your setup, it's not the end of the world. Just shut down the PS3 and when you restart, hold down the power button for about 10 seconds until you hear a second 'beep.' Release the button and you'll be forwarded to XMB where you can start the journey again.
Continuing on from the cursor on your screen next to Kboot: If you're utilizing an old-school CRT TV, type 'Install.' However, If you've moved past 1998 and you're running an HD TV, you'll want to take note of your monitor's best native resolution and type out the following string and hit enter:
install video=ps3fb:mode:X
where X is one of the following values: 1,2,3,4 or 5. Refer to the below chart for the correct setting:
1: 480i
2:480p
3: 720p
4: 1080i
5: 1080p
Therefore, if you have a 1080p TV, the text should look like this: install video=ps3fb:mode:5
After you've started the setup, you'll be asked a few questions as the install progresses. Here are our suggested answers.
If possible, choose 'Ethernet' as primary over wireless. If running an Ethernet cable from your router to the PS3 is totally out of the question, then go ahead and highlight wireless instead. Be aware, however, that Ubuntu isn't the best of friends with WPA encryption, and this might confuse the installer and result in an error. A WEP key is a better bet.
Give yourself a network host name. Or, if your imagination has run hopelessly dry, you can just use the default 'Ubuntu' and hit 'Continue.'
When asked whether or not to enable Serial ATA RAID, select 'Yes.'

To tell the OS how to partition the hard disc, select the first option 'Guided – use entire disk,' and then continue.
Give your new Ubuntu sector a login name and a password.

When asked whether or not to setup an encrypted file directory, enter 'No.'
Leave the Http: Proxy field blank when prompted and continue.
The main software installation will now begin. This is the long leg of the journey, and can take upwards of 45 to 60 minutes, but luckily, it shouldn't require any input on your end. For some setups, you might notice that the progress meter gets stuck around 6%, but give it about 15 minutes and it should soldier onward. If you instead receive an error message, or if the 6% stays in place for over an hour (as it did with us the first go around), you probably have a corrupted ISO disk and you'll need to re-burn the ISO file at a slower speed.

Once the installation has finished, go ahead and set your system clock when prompted. After that, you'll be asked to remove the install disk. Do so, and then click enter. Enter your user name and password into the following splash screen, and presto: you're now surfing Ubuntu Intrepid Ibex from the cozy confines of your gigantic plush beanbag.

Step 5: A Few Handy Tips
The terminal is your friend, especially for app installations. To open it, go to 'Application' → 'Accessories' → 'Terminal.'
By default, the Ubuntu / Kboot loader will setup PCM audio, which is an audio codec suitable for most HDMI and Optical connections. We were able to get sound right from the get-go using both an HDMI cable connected to an LCD's integrated speakers as well as an optical cable hitched into a Dolby Digital external receiver. Just make sure Ubuntu's sound isn't muted; to check, double-click the speaker icon in the upper right-hand corner of the desktop and make sure the duo sliders are raised midway up the level bar, not on the very bottom.
To immediately enable multimedia codecs (MP3, etc.) go to the terminal and type this string, and then hit enter:
sudo apt-get install ubuntu-restricted-extras
Firefox comes pre-bundled. Use it!
In case you missed it: to boot back into XMB, shut down the PS3 from within Ubuntu. Once the console has powered off completely, hold down the power button for about 10 seconds until you hear a second beep. Release the power button and you'll be forwarded to the PS3's primary OS. Conversely, to load up Ubuntu, just follow the prior instructions on changing the PS3 default OS, and then hit 'Enter' after the text screen loads.
