Indeed, why does it? There are files under /usr/local/lib/python2.7 and
3.7, probably the result of pip and pip3?, but so what? Why isn't
anything else broken by their existense?

I don't see any python-related variables in my env exept:
PYTHONPYCACHEPREFIX=/var/cache/python

"python" resolves to:
bkw@negre:~$ which python
/usr/bin/python
bkw@negre:~$ python --version
Python 2.7.17
bkw@negre:~$ dpkg -S /usr/bin/python
python-minimal: /usr/bin/python
bkw@negre:~$ 
bkw@negre:~$ apt show python-minimal
Package: python-minimal
Version: 2.7.17-1
Priority: optional
Section: universe/python
Source: python-defaults
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-disc...@lists.ubuntu.com>
Original-Maintainer: Matthias Klose <d...@debian.org>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 44.0 kB
Depends: python2.7-minimal (>= 2.7.17~rc1-1~), dpkg (>= 1.13.20), 
python2-minimal (= 2.7.17-1)
Recommends: python
Conflicts: python-central
Breaks: idle (<< 2.6), python (<= 2.7.3-1~), python-all (<< 2.6), 
python-all-dbg (<< 2.6), python-all-dev (<< 2.6), python-dbg (<< 2.6), 
python-dev (<< 2.6), python-examples (<< 2.6), python-support (<< 
1.0.10ubuntu2), python2.5-minimal (<< 2.5.5-7), python2.6-minimal (<< 
2.6.5~rc2-2), python3.1-minimal (<< 3.1.2~rc1-2)
Replaces: python (<= 2.7.3-1~)
Homepage: https://www.python.org/
Task: xubuntu-desktop, ubuntustudio-desktop-core, ubuntustudio-desktop, 
ubuntukylin-desktop, ubuntu-mate-core, ubuntu-mate-desktop
Download-Size: 5,996 B
APT-Manual-Installed: no
APT-Sources: http://us.archive.ubuntu.com/ubuntu eoan/universe amd64 Packages
Description: minimal subset of the Python2 language
 This package contains the interpreter and some essential modules.  It's used
 in the boot process for some basic tasks.
 See /usr/share/doc/python2.7-minimal/README.Debian for a list of the modules
 contained in this package.

bkw@negre:~$

---------------

"python3" resolves to:

bkw@negre:~$ which python3
/usr/bin/python3
bkw@negre:~$ python3 --version
Python 3.7.5
bkw@negre:~$ dpkg -S /usr/bin/python3
python3-minimal: /usr/bin/python3
bkw@negre:~$ apt show python3-minimal
Package: python3-minimal
Version: 3.7.5-1
Priority: important
Section: python
Source: python3-defaults
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-disc...@lists.ubuntu.com>
Original-Maintainer: Matthias Klose <d...@debian.org>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 124 kB
Pre-Depends: python3.7-minimal (>= 3.7.5~rc1-1~)
Depends: dpkg (>= 1.13.20)
Homepage: https://www.python.org/
Task: minimal, ubuntu-desktop-minimal-default-languages, 
ubuntu-desktop-minimal-default-languages, 
ubuntu-desktop-minimal-default-languages, 
ubuntu-desktop-minimal-default-languages, 
ubuntu-desktop-minimal-default-languages, 
ubuntu-desktop-minimal-default-languages, 
ubuntu-desktop-minimal-default-languages, ubuntu-desktop-default-languages, 
ubuntu-desktop-default-languages, ubuntu-desktop-default-languages, 
ubuntu-desktop-default-languages, ubuntu-desktop-default-languages, 
ubuntu-desktop-default-languages, ubuntu-desktop-default-languages, 
ubuntu-desktop-default-languages, ubuntu-core
Supported: 9m
Download-Size: 23.3 kB
APT-Manual-Installed: yes
APT-Sources: http://us.archive.ubuntu.com/ubuntu eoan/main amd64 Packages
Description: minimal subset of the Python language (default python3 version)
 This package contains the interpreter and some essential modules.  It's used
 in the boot process for some basic tasks.
 See /usr/share/doc/python3.7-minimal/README.Debian for a list of the modules
 contained in this package.

bkw@negre:~$

An all the python3 packages listed in Depends: are installed, else apt
would not have allowed installing the krop package.

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https://bugs.launchpad.net/bugs/1864637

Title:
  krop and dependencies installs without error, but does not run

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