Crash | Upgate manager from GUI when clicked on install | File "/usr/lib/python3/dist-packages/UpdateManager/UpdatesAvailable.py", line 882, in on_button_install_clicked

[Kumar Vaibhav]

OS:
lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu Hirsute Hippo (development branch)
Release: 21.04
Codename: hirsute

Python version:
Python 3.9.1

Terminal o/p on running /usr/bin/python3 /usr/bin/update-manager --no-update --no-focus-on-map and clcik on 'Install Now' button

Stacktrace:
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 882, 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

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubuntu-release-upgrader-core 1:21.04.3
ProcVersionSignature: Ubuntu 5.8.0-34.37+21.04.1-generic 5.8.18
Uname: Linux 5.8.0-34-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu55
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 10 02:35:16 2021
InstallationDate: Installed on 2018-02-21 (1053 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180214)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to hirsute on 2020-12-20 (20 days ago)
VarLogDistupgradeTermlog:

[Kumar Vaibhav (kumarv1988)]

The recent update looks to be okay and working fine as per described scenario:

What's changed

At the time of bug report 2021-01-10
ubuntu-release-upgrader version: ubuntu-release-upgrader-core 1:21.04.3
Python Version: Python 3.9.1

After update on 2021-01-12
ubuntu-release-upgrader version: ubuntu-release-upgrader-core/hirsute-proposed,hirsute-proposed,now 1:21.04.4 all [installed]
Python Version: Python 3.9.1+

[Brian Murray (brian-murray)]

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