Update manager failed by python

[shameerariff]

Whenever the update-manager starts,the following error occurs if software-properties-gtk is opened that also lead to the error which was listed next to update-manager

$ sudo update-manager
Checking for a new Ubuntu release
authenticate 'groovy.tar.gz' against 'groovy.tar.gz.gpg'
extracting 'groovy.tar.gz'
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeQuirks.py", line 197, in _get_from_and_to_version
    di.version('%s' % self.controller.fromDist).split()[0]
AttributeError: 'UbuntuDistroInfo' object has no attribute 'version'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-9omt7t12/groovy", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeMain.py", line 238, in main
    if app.run():
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeController.py", line 2089, in run
    return self.fullUpgrade()
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeController.py", line 1926, in fullUpgrade
    if not self.doPostInitialUpdate():
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeController.py", line 924, in doPostInitialUpdate
    self.quirks.run("PostInitialUpdate")
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeQuirks.py", line 99, in run
    func()
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeQuirks.py", line 118, in groovyPostInitialUpdate
    self._get_from_and_to_version()
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeQuirks.py", line 203, in _get_from_and_to_version
    (r.version for r in di.get_all("object")
AttributeError: 'UbuntuDistroInfo' object has no attribute 'get_all'
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/problem_report.py", line 477, in add_to_existing
    self.write(f)
  File "/usr/lib/python3/dist-packages/problem_report.py", line 430, in write
    block = f.read(1048576)
  File "/usr/lib/python3.8/codecs.py", line 322, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte

Original exception was:
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeQuirks.py", line 197, in _get_from_and_to_version
    di.version('%s' % self.controller.fromDist).split()[0]
AttributeError: 'UbuntuDistroInfo' object has no attribute 'version'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-9omt7t12/groovy", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeMain.py", line 238, in main
    if app.run():
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeController.py", line 2089, in run
    return self.fullUpgrade()
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeController.py", line 1926, in fullUpgrade
    if not self.doPostInitialUpdate():
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeController.py", line 924, in doPostInitialUpdate
    self.quirks.run("PostInitialUpdate")
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeQuirks.py", line 99, in run
    func()
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeQuirks.py", line 118, in groovyPostInitialUpdate
    self._get_from_and_to_version()
  File "/tmp/ubuntu-release-upgrader-9omt7t12/DistUpgrade/DistUpgradeQuirks.py", line 203, in _get_from_and_to_version
    (r.version for r in di.get_all("object")
AttributeError: 'UbuntuDistroInfo' object has no attribute 'get_all'

$ software-properties-gtk
ERROR:dbus.proxies:Introspect error on :1.198:/: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message bus without replying
Traceback (most recent call last):
  File "/usr/bin/software-properties-gtk", line 100, in <module>
    app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, file=file)
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 211, in __init__
    self.backend.Reload();
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 72, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 141, in __call__
    return self._connection.call_blocking(self._named_service,
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 652, in call_blocking
    reply_message = self.send_message_with_reply_and_block(
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name :1.198 was not provided by any .service files