Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py", line 719, in foreach_cb
    if pkg and self.pkg_requires_restart(pkg):
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py", line 393, in pkg_requires_restart
    restart_condition = pkg.candidate.record.get('Restart-Required')
  File "/usr/lib/python3/dist-packages/apt/package.py", line 714, in record
    return Record(self._records.record)
  File "/usr/lib/python3/dist-packages/apt/package.py", line 541, in _records
    if not self.package._pcache._records.lookup(self._cand.file_list[0]):
AttributeError: 'NoneType' object has no attribute 'lookup'