Traceback (most recent call last):
  File "/usr/bin/update-manager", line 117, in <module>
    app = UpdateManager(data_dir, options)
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 120, in __init__
    self.options and self.options.use_proposed)
  File "/usr/lib/python3/dist-packages/UpdateManager/MetaReleaseGObject.py", line 44, in __init__
    MetaReleaseCore.__init__(self, useDevelopmentRelease, useProposed)
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 100, in __init__
    cache = apt.Cache()
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 166, in __init__
    self.open(progress)
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 226, in open
    self._cache = apt_pkg.Cache(progress)
apt_pkg.Error: E:can not open /var/lib/apt/lists/archive.canonical.com_ubuntu_dists_disco_InRelease - fopen (13: Permission denied), E:The package lists or status file could not be parsed or opened.