Ubuntu RFS building is practically a (time consuming) handwork.
It is necessary to load , build and test (manually) every package
You need to optimize. And finally - to place binary images to filesystem.
I am afraid, Oneiric is not supported as long term version.
Below is a website to search the ubuntu rootfs component versions:
http://www.ubuntuupdates.org/
Have a great day,
Yuri
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