ValueError: package does not exist when using ubuntu-bug update-manager

Hello, while reporting a bug on focal against the update-manager source package, I got an error:

$ ubuntu-bug update-manager-core

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ERROR: hook /usr/share/apport/package-hooks/source_update-manager.py crashed:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport/report.py", line 225, in _run_hook
    symb['add_info'](report, ui)
  File "/usr/share/apport/package-hooks/source_update-manager.py", line 47, in add_info
    attach_gsettings_package(report, 'update-manager')
  File "/usr/lib/python3/dist-packages/apport/hookutils.py", line 649, in attach_gsettings_package
    for schema_file in files_in_package(package, '/usr/share/glib-2.0/schemas/*.gschema.xml'):
  File "/usr/lib/python3/dist-packages/apport/hookutils.py", line 595, in files_in_package
    files = packaging.get_files(package)
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 365, in get_files
    list = self._call_dpkg(['-L', package])
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 1197, in _call_dpkg
    raise ValueError('package does not exist')
ValueError: package does not exist
...

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Thanks

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: update-manager-core 1:20.04.9
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
Date: Wed May 13 23:12:23 2020
PackageArchitecture: all
ProcEnviron:
 TERM=rxvt-unicode-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to focal on 2020-01-24 (110 days ago)