Update:
I tried to install gimp-python from my previous Debian install, and it failed with dependency issues:
scott@ASUS-Prime-B350M-A-CSM:~$ sudo dpkg -i /home/scott/Downloads/gimp-python_2.10.8-2+b1_amd64.deb
Selecting previously unselected package gimp-python.
(Reading database ... 331569 files and directories currently installed.)
Preparing to unpack .../gimp-python_2.10.8-2+b1_amd64.deb ...
Unpacking gimp-python (2.10.8-2+b1) ...
dpkg: dependency problems prevent configuration of gimp-python:
gimp-python depends on python:any.
gimp-python depends on python-gtk2 (>= 2.8.0); however:
Package python-gtk2 is not installed.
dpkg: error processing package gimp-python (--install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
gimp-python
It wants python-gtk2, but...
scott@ASUS-Prime-B350M-A-CSM:~$ apt-cache policy python-gtk2
python-gtk2:
Installed: (none)
Candidate: (none)
Version table:
...that is also unavailable.
I then grabbed python-gtk2 from my previous Debian, and tried to install both:
scott@ASUS-Prime-B350M-A-CSM:~$ sudo dpkg -i /home/scott/Downloads/gimp-python_2.10.8-2+b1_amd64.deb
/home/scott/Downloads/python-gtk2_2.24.0-6_amd64.deb
(Reading database ... 331612 files and directories currently installed.)
Preparing to unpack .../gimp-python_2.10.8-2+b1_amd64.deb ...
Unpacking gimp-python (2.10.8-2+b1) over (2.10.8-2+b1) ...
Selecting previously unselected package python-gtk2.
Preparing to unpack .../python-gtk2_2.24.0-6_amd64.deb ...
Unpacking python-gtk2 (2.24.0-6) ...
dpkg: dependency problems prevent configuration of gimp-python:
gimp-python depends on python:any.
dpkg: error processing package gimp-python (--install):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of python-gtk2:
python-gtk2 depends on python (<< 2.8); however:
Package python is not installed.
python-gtk2 depends on python (>= 2.7); however:
Package python is not installed.
python-gtk2 depends on python-numpy (>= 1:1.16.0~rc1); however:
Package python-numpy is not installed.
python-gtk2 depends on python-numpy-abi9; however:
Package python-numpy-abi9 is not installed.
python-gtk2 depends on python:any (>= 2.6.6-7~); however:
python-gtk2 depends on python-cairo (>= 1.0.2-1.1); however:
Package python-cairo is not installed.
python-gtk2 depends on python-gobject-2 (>= 2.21.3); however:
Package python-gobject-2 is not installed.
dpkg: error processing package python-gtk2 (--install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
gimp-python
python-gtk2
I note that gimp-python is part of the gimp source package.
Is gimp-python being upgraded to use python 3?