So the (open) sources of this font family are available in a closed format and not a single tool used by the designer is available on Ubuntu itself without resorting to convoluted solutions and (possibly) breaking a bunch of licences in the process.
What if an actual enthusiastic Ubuntu user wants to participate in the project or fork it? Well he is forced to tinker with wine or work on a Windows PC or buy a Mac.
I guess Canonical couldn't find any professional type designers who are also free software martyrs. The solution to this problem should be to improve the free tools, not to ask pros to reduce their productivity.
What if an actual enthusiastic Ubuntu user wants to participate in the project or fork it? Well he is forced to tinker with wine or work on a Windows PC or buy a Mac.
Great.