This command fixed it for me. It reinstall the python 2 and 3 decorator
apt install --reinstall python\*-decorator
On Debian place or python3 packages (/usr/lib/python3/dist-packages/)
the scipy/_lib/decorator module is a symlink to the decorator module it
/usr/lib/python3/dist-packages/scipy/_lib# ls -l decorator.py
lrwxrwxrwx 1 root root 18 Sep 25 06:25 decorator.py -> ../../decorator.py
The package python-decorator and python3-decorator is a requirement for
python-scipy and python3-scipy. According to apt, these decorator
packages are installed. I checked the installed files with:
# dpkg -L python3-decorator
But the file /usr/lib/python3/dist-packages/decorator.py was missing.
Something in my system should (the user perhaps) should have messed with
it. After I forced the reinstall of this packages, it came back to work
again. But it's really strange this file gone missing.
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package python3-scipy 0.17.0-1 failed to install/upgrade: subprocess
installed post-installation script returned error exit status 1
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