Until Ubuntu 15.10 it was possible to install Celestia (a real-time 3D space simulation), using apt:
sudo apt-get install celestia celestia-gnome celestia-common-nonfree
However, in Ubuntu 16.04, the package
celestia no longer seems to exist. (
apt-cache show celestia returns
N: Can't select versions from package 'celestia' as it is purely virtual. The package
celestia-common-nonfree does exist, but it's just a collection of data files, which don't conform to the DFSG, that are useless without the program itself.)
Looking upstream, it seems that the package celestia was removed from Debian unstable, before Ubuntu 16.04 entered feature freeze, which (assuming my very vague understanding of the interaction between Debian and Ubuntu is correct) is why it's no longer present in Ubuntu 16.04.
Considering that Celestia hasn't seen any development in the recent past, removing it seems a reasonable course of action. OTOH it's still stable and functional, so it seems a shame, especially if it's still possible to build it on a modern system.
Does this mean that the only way of installing Celestia on Ubuntu 16.04 is building from source?