sam@home-pc:~$ sudo dpkg -P libapt-pkg5.0:amd64 synaptic:amd64
dpkg: dependency problems prevent removal of libapt-pkg5.0:amd64:
 apt-transport-https:amd64 depends on libapt-pkg5.0 (>= 1.5~beta2~).

dpkg: error processing package libapt-pkg5.0:amd64 (--purge):
 dependency problems - not removing
(Reading database ... 405502 files and directories currently installed.)
Removing synaptic:amd64 (0.84.2) ...
Purging configuration files for synaptic:amd64 (0.84.2) ...
Processing triggers for man-db (2.7.6.1-2) ...
Processing triggers for hicolor-icon-theme (0.17-1) ...
Processing triggers for desktop-file-utils (0.23-1ubuntu3) ...
Processing triggers for bamfdaemon (0.5.3+17.10.20170810-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for mime-support (3.60ubuntu1) ...
Processing triggers for gnome-menus (3.13.3-6ubuntu5) ...
Errors were encountered while processing:
 libapt-pkg5.0:amd64