"Packaging Unity wasn't much of a problem, but implementing is being translated into frustration," Marques wrote in a blog post on Tuesday. That "and the lack of satisfactory results eventually lead to pre-burnout situations, and I'm not walking that road."
Marques cited problems he encountered as part of his frustration, including "Compiz behavior on several different git snapshots" as well as "the default gconf settings required by Unity and the backup/restore operations from openSUSE defaults."
Compiz is the window manager that will be used by default alongside Unity in Natty Narwhal.
"It's maybe wiser to wait for a bit more of development from upstream before looking into this," Marques concluded. "openSUSE is supposed to be stable and reliable, and I don't see this branch of Compiz match those two qualities yet."
Ubuntu Stands Alone
Both developers did welcome the involvement of others interested in the effort, and Marques said he'd look into it again later, "once there's an official Compiz release from the branch that is required for Unity."
In the meantime, however, it looks like Natty Narwhal--the final version of which is expected to be released in late April--will be the only one with Unity enabled by default, at least for the near future.
Unity can now be seen in the second alpha version of Natty, which is now available for download on the Ubuntu site. A video on YouTube demonstrates the release in action. If you've checked the new interface out, please share your impressions in the comments.