update-manager wrong package grouping

[fcole90]

From time to time the update-manager shows packages due for update, putting some them into groups. Sometimes the grouping is clearly wrong, especially the package used as anchor of the group.

See the attached screenshot: a number of packages are shown as belonging to Visual Studio code group, which they are not.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: update-manager 1:19.04.8
ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
Uname: Linux 5.3.0-19-generic x86_64
ApportVersion: 2.20.11-0ubuntu9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Nov 18 17:56:06 2019
ExecutablePath: /usr/bin/update-manager
InstallationDate: Installed on 2019-02-03 (287 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
InterpreterPath: /usr/bin/python3.7
PackageArchitecture: all
Python3Details: /usr/bin/python3.7, Python 3.7.5, python3-minimal, 3.7.5-1
PythonDetails: /usr/bin/python2.7, Python 2.7.17, python-minimal, 2.7.17-1
SourcePackage: update-manager
UpgradeStatus: Upgraded to focal on 2019-07-21 (120 days ago)