dpkg: ERROR: pydb is broken

[themusicgod1]

Upon installing pydb via aptitude, an error message appears during install:

"ERROR: pydb is broken - called emacs-package-install as a new-style add-on, but has no compat file."

(this suggests something between emacs24 and emacs25 has changed, since this error message did not appear to be present for emacs24 - see https://bugs.launchpad.net/debian/+source/pydb/+bug/1537938 )

Ubuntu: 17.04 zesty
pydb:
  Installed: 1.26-2
  Candidate: 1.26-2
emacs:
  Installed: (none)
  Candidate: 46.1ubuntu1
emacs25:
  Installed: 25.1+1-3ubuntu4
  Candidate: 25.1+1-3ubuntu4

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: pydb 1.26-2
ProcVersionSignature: Ubuntu 4.10.0-20.22-generic 4.10.8
Uname: Linux 4.10.0-20-generic x86_64
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
Date: Mon May 8 12:13:37 2017
Dependencies:

InstallationDate: Installed on 2017-04-18 (19 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: pydb
UpgradeStatus: No upgrade log present (probably fresh install)

[themusicgod1 (themusicgod1)]

pydb isn't in focal anymore