Ubuntu briefly included Mono-based apps in the core distribution. Sadly the backlash controversy after that around the size of the Mono runtime (which wasn't mu

Ubuntu briefly included Mono-based apps in the core distribution. Sadly the backlash controversy after that around the size of the Mono runtime (which wasn't much bigger than Python at the time, but got a bit of a "but we've already got Python, we don't need 2 Pythons" in response, and ahead of the whole python2/python3 split, hah) and the worse controversy about Microsoft-adjacent conspiracy theories did a lot of damage to the then-nascent world of Gtk+ based .NET apps in Linux and left some scars. The first part seems to add confidence that if the right apps/developers came along, Canonical themselves likely wouldn't have a problem putting them in the distribution. The second part would explain why there aren't just apps waiting in the wings for it and why "the community" (or at least certain vocal parts) may still not be as welcoming of .NET-based apps in the distribution this time around like it played out that previous time.