PS3 CD builds stopped for Natty

Official Statement

Of course, Sony offered the option to not update your PS3 console if you still wanted to have a Linux operating system installed on it (or to back up your data from the Linux partition), but, on the other hand, you will no longer have access to various important features, such as signing into the PlayStation Network!

http://news.softpedia.com/news/It-s-Official-Sony-Doesn-t-Support-Linux-Anymore-139051.shtml

http://blog.us.playstation.com/2010/03/28/ps3-firmware-v3-21-update/

The new update release notes said very clear that it would remove the “Other OS” function!

If you have a good reason why we should keep building PS3 CD images for
Natty, and are willing to step up as a developer to help support them,
then please reply to ubuntu-devel at lists.ubuntu.com.