Regarding Ubuntu Bionic, I found:
https://news.softpedia.com/news/ubuntu-devs-work-on-demoting-python-2-to-universe-repo-for-ubuntu-18-04-lts-518926.shtml
which says that the Ubuntu devs were working to "demote Python 2 to
Universe" but that this would probably not happen in time for the Bionic
release.
This gives an idea of how difficult it is to fully transition to Python
3 at the distro level.
In light of everything I have written on this subject, my suggestion is
for us to change all our code that calls Python so it:
(a) checks for the existence of /usr/bin/python2 and /usr/bin/python3
(b) prefers python3
But maybe for Nautilus it's enough to do just (a) and continue to prefer
python2? Python 2 will not be deprecated upstream until 2020.
Nathan
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