update-manager: UnboundLocalError: local variable 'pkgs_install_oem' referenced before assignment

[Bigbiz]

This after launching update-manager in a terminal's window:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/UpdateManager/Dialogs.py", line 118, in <lambda>
    button.connect("clicked", lambda x: callback())
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py", line 880, in on_button_install_clicked
    self.window_main.start_install()
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 234, in start_install
    self._start_pane(install_backend)
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 174, in _start_pane
    pane.start()
  File "/usr/lib/python3/dist-packages/UpdateManager/backend/__init__.py", line 61, in start
    self.commit_oem(pkgs_install_oem, pkgs_upgrade_oem)
UnboundLocalError: local variable 'pkgs_install_oem' referenced before assignment

I tried with sudo but nothing to do.

I've the same problem on 3 systems.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: update-manager 1:20.04.10.2
ProcVersionSignature: Ubuntu 5.4.0-59.65-generic 5.4.78
Uname: Linux 5.4.0-59-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Jan 7 16:30:48 2021
ExecutablePath: /usr/bin/update-manager
InstallationDate: Installed on 2019-04-13 (635 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
InterpreterPath: /usr/bin/python3.8
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
SourcePackage: update-manager
UpgradeStatus: Upgraded to focal on 2020-12-29 (8 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Julian Andres Klode (juliank)]

Thanks for your bug report. This is a package from the proposed pocket which is not meant to be used by end users.

It is a regression in the fix for bug 1908050.

[Julian Andres Klode (juliank)]

This was fixed in hirsute in

update-manager (1:21.04.3) hirsute; urgency=medium

  [ Brian Murray ]
  * UpdateManager/Dialogs.py: do not mention livepatch settings when the
    interface is not installed, thanks to Sebastien Bacher for the patch.
    (LP: #1807900)
  * UpdateManager/backend/__init__.py: Resolve unbound local error crash with
    oem package lists. Thanks to Thomas Bechtold for the patch.

  [ William Wilson ]
  * UpdateManager/Core/UpdateList.py: change to a regex from a static list
    of packages to be grouped under Ubuntu Base (LP: #1902025)

 -- Brian Murray <email address hidden> Fri, 08 Jan 2021 08:41:47 -0800

[Andy Whitcroft (apw)]

An upload of update-manager to focal-proposed has been rejected from the upload queue for the following reason: "Missing -v for current proposed version.".

[Mathew Hodson (mhodson)]

This bug was fixed in the package update-manager - 1:20.04.10.3

---------------
update-manager (1:20.04.10.3) focal; urgency=medium

  [ Julian Andres Klode ]
  * UpdateManager/backend/__init__.py: Fix unbound local variables regression
    introduced by the previous SRU (See LP 1910556), and correct comment

  [ William Wilson ]
  * UpdateManager/Core/UpdateList.py: change to a regex from a static list
    of packages to be grouped under Ubuntu Base (LP: #1902025)

update-manager (1:20.04.10.2) focal; urgency=medium

  [ Iain Lane & Julian Andres Klode ]
  * Support post install enablement of OEM-enabled devices (LP: #1908050)

 -- Brian Murray <email address hidden> Wed, 13 Jan 2021 08:35:58 -0800