The important part from the thread raja has given you is this:
Doesn't matter if before or after 'quiet splash'. It is generally after.
I'm presuming you have already installed? If so, when you get to the grub list (where you choose OS, if you don't get there but go straight to the dot screen then press 'shift' or 'escape' after BIOS, depending on release, and that will take you there) choose the kernel you are wanting to boot then hit 'e'.
Then follow the instructions above; add 'nomodset' to the kernel line. If that doesn't work, try 'acpi=off'. You don't need to add all the options outlined in that link (in fact, it could be a bad idea to do that).
If you haven't yet installed, easier still. As the link suggests, when you boot from the CD to install and get to the screen with 'Try Ubuntu, Install Ubuntu' etc. hit F6 and choose 'nomodset'. Continue with the install.
Good luck.
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