If you upgraded to Ubuntu 26.04, have an old Python script that uses multiprocessing (with no threading), and "ps -ef | grep python" suddenly looks like a war and peace manuscript. In 2 minutes Claude will tell you the secret one line to make Python 3.14 behave like Python 3.12 did for you up until now.
Spoiler: multiprocessing.set_start_method('fork')
How does Claude know all these things?

