sudo update-manager 

(update-manager:211505): dconf-WARNING **: 23:49:21.408: failed to commit changes to dconf: Failed to execute child process “dbus-launch” (No such file or directory)

(update-manager:211505): dconf-WARNING **: 23:49:21.409: failed to commit changes to dconf: Failed to execute child process “dbus-launch” (No such file or directory)

(update-manager:211505): libunity-CRITICAL **: 23:49:21.419: file unity-launcher.c: line 1638: unexpected error: Failed to execute child process “dbus-launch” (No such file or directory) (g-exec-error-quark, 8)

(update-manager:211505): libunity-CRITICAL **: 23:49:21.419: unity_launcher_entry_dbus_impl_construct: assertion 'conn != NULL' failed

(update-manager:211505): libunity-CRITICAL **: 23:49:21.423: unity-inspector.vala:96: Unable to connect to session bus: Failed to execute child process “dbus-launch” (No such file or directory)
warning: could not initiate dbus
/usr/lib/python3/dist-packages/uaclient/apt.py:288: Warning: W:Unable to read /var/lib/ubuntu-advantage/apt-esm/etc/apt/apt.conf.d/ - DirectoryExists (2: No such file or directory)
  apt_pkg.init()
/usr/lib/python3/dist-packages/uaclient/apt.py:270: Warning: W:Unable to read /var/lib/ubuntu-advantage/apt-esm/etc/apt/preferences.d/ - DirectoryExists (2: No such file or directory)
  apt_pkg.init_system()
ERROR:root:not handled exception:
Traceback (most recent call last):

  File "/usr/lib/ubuntu-release-upgrader/do-partial-upgrade", line 114, in <module>
    controller.doPartialUpgrade()

  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeController.py", line 2609, in doPartialUpgrade
    self.prepare()

  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeController.py", line 465, in prepare
    if not self._pythonSymlinkCheck():
           ^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeController.py", line 415, in _pythonSymlinkCheck
    config.readfp(f)
    ^^^^^^^^^^^^^

AttributeError: 'ConfigParser' object has no attribute 'readfp'. Did you mean: 'read'?

Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeViewGtk3.py", line 540, in _handleException
    apport_crash(type, value, tb)
  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeApport.py", line 57, in apport_crash
    apport_excepthook(type, value, tb)
TypeError: apport_excepthook() missing 1 required positional argument: 'exc_tb'

Original exception was:
Traceback (most recent call last):
  File "/usr/lib/ubuntu-release-upgrader/do-partial-upgrade", line 114, in <module>
    controller.doPartialUpgrade()
  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeController.py", line 2609, in doPartialUpgrade
    self.prepare()
  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeController.py", line 465, in prepare
    if not self._pythonSymlinkCheck():
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeController.py", line 415, in _pythonSymlinkCheck
    config.readfp(f)
    ^^^^^^^^^^^^^
AttributeError: 'ConfigParser' object has no attribute 'readfp'. Did you mean: 'read'?