Dependency problem

[zu1fIq4r]

I was installing zenmap but it won't start so then i watched some yt videos and found a solution.
When I tried to installing those deb packages then this happened.
Plz help

└─$ sudo dpkg -i python-gobject-2_2.28.6-14ubuntu1_amd64.deb
(Reading database ... 412258 files and directories currently installed.)
Preparing to unpack python-gobject-2_2.28.6-14ubuntu1_amd64.deb ...
Unpacking python-gobject-2 (2.28.6-14ubuntu1) over (2.28.6-14ubuntu1) ...
dpkg: dependency problems prevent configuration of python-gobject-2:
python-gobject-2 depends on libffi7 (>= 3.3~20180313); however:
Package libffi7 is not installed.

dpkg: error processing package python-gobject-2 (--install):
dependency problems - leaving unconfigured
Processing triggers for libc-bin (2.37-5) ...
Errors were encountered while processing:
python-gobject-2