It seems it somehow slipped under the radar. While MS is busy with shooting their feets off, FlightGear team released 2.6 version of their sim.
For details see FlightGear 2.6 release announcement
And ofcourse few mandatory screenies:

Hi Xeno,

Thanks for the headsup.

Any idea, how to instal this to the Ubuntu 11.10?

If it's not in official repo maybe somwhere in PPA? I'm Fedora guy.
There's some info on FG download page if you scroll down a bit.

Also, you can build it from source if you want to.