This is all explained and described on the wiki under the Kubuntu
Artwork Philosophy section:
https://wiki.ubuntu.com/Artwork/Documentation/KubuntuPhilosophy
Bear in mind that this is a work in progress, and changes will continue
to happen. It states that O2 is indeed a working name and not the
** Changed in: kubuntu-default-settings (Ubuntu)
Status: Rejected = In Progress
--
the default kubuntu colour scheme has a non obvious name
https://launchpad.net/bugs/57426
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** Changed in: kubuntu-default-settings (Ubuntu)
Status: In Progress = Fix Released
--
the default kubuntu colour scheme has a non obvious name
https://launchpad.net/bugs/57426
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kubuntu-bugs mailing list
kubuntu-bugs@lists.ubuntu.com