[Bug 1910803] [NEW] update-manager display a blank window in version 1:20.04.10.2

[dominix]

Public bug reported:

First I have upgraded update-manager-core update-manager python3-update-
manager to version 1:20.04.10.2  on my Focal LTS 20.04 machine

then after "apt update" update-manager shows up to propose the upgrade of the system.
this windows is correctly displayed, but if I click on "upgrade" then a new empty windows appear and do not show nothing and the process of upgrading is stopped.

the only way to retrieve functionnality is to roll-back to version
1:20.04.10.1

"sudo apt install --reinstall update-manager-core=1:20.04.10.1 update-
manager=1:20.04.10.1 python3-update-manager=1:20.04.10.1"

then things are back to normal.

I have tested this process on Three focal machine with same results, so
it looks 1:20.04.10.2 clearly has a bug.

thanks for your continuous support. regards.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: update-manager 1:20.04.10.1
ProcVersionSignature: Ubuntu 5.4.0-59.65-generic 5.4.78
Uname: Linux 5.4.0-59-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Fri Jan  8 08:47:50 2021
GsettingsChanges:
 b'com.ubuntu.update-manager' b'window-width' b'657'
 b'com.ubuntu.update-manager' b'launch-count' b'235'
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'launch-time' b'int64 1610131614'
 b'com.ubuntu.update-manager' b'window-height' b'419'
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: Upgraded to focal on 2020-06-23 (199 days ago)

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal third-party-packages

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https://bugs.launchpad.net/bugs/1910803

Title:
  update-manager display a blank window in version 1:20.04.10.2

Status in update-manager package in Ubuntu:
  New

Bug description:
  First I have upgraded update-manager-core update-manager python3
  -update-manager to version 1:20.04.10.2  on my Focal LTS 20.04 machine

  then after "apt update" update-manager shows up to propose the upgrade of the system.
  this windows is correctly displayed, but if I click on "upgrade" then a new empty windows appear and do not show nothing and the process of upgrading is stopped.

  the only way to retrieve functionnality is to roll-back to version
  1:20.04.10.1

  "sudo apt install --reinstall update-manager-core=1:20.04.10.1 update-
  manager=1:20.04.10.1 python3-update-manager=1:20.04.10.1"

  then things are back to normal.

  I have tested this process on Three focal machine with same results,
  so it looks 1:20.04.10.2 clearly has a bug.

  thanks for your continuous support. regards.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: update-manager 1:20.04.10.1
  ProcVersionSignature: Ubuntu 5.4.0-59.65-generic 5.4.78
  Uname: Linux 5.4.0-59-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: MATE
  Date: Fri Jan  8 08:47:50 2021
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'window-width' b'657'
   b'com.ubuntu.update-manager' b'launch-count' b'235'
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'launch-time' b'int64 1610131614'
   b'com.ubuntu.update-manager' b'window-height' b'419'
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to focal on 2020-06-23 (199 days ago)

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