[Bug 2147517] Re: release upgrader crashed: TypeError: Argument 0 does not allow None as a value

[Launchpad Bug Tracker]

This bug was fixed in the package ubuntu-release-upgrader - 1:26.04.18

---------------
ubuntu-release-upgrader (1:26.04.18) resolute; urgency=medium

  * test: make arm64 specific data where needed
  * test: only run test_arm64_ports_rewrite on arm64
  * Run pre-build.sh: updating mirrors.

ubuntu-release-upgrader (1:26.04.17) resolute; urgency=medium

  [ Nick Rosbrook ]
  * DistUpgrade: do not call GLib.markup_escape_text with None (LP: #2147517)
  * Run pre-build.sh: updating mirrors.

  [ Utkarsh Gupta ]
  * DistUpgradeController: migrate arm64 sources from ports to archive on
    upgrade. (LP: #2147101)

 -- Nick Rosbrook <enr0n at ubuntu.com>  Wed, 22 Apr 2026 13:29:32 -0400

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2147517

Title:
  release upgrader crashed: TypeError: Argument 0 does not allow None as
  a value

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released

Bug description:
  I upgraded from questing to resolute, but the release upgrader
  crashed. I tried to start it again, but it crashed again. I collected
  this stack trace:

  ```
  localuser:root being added to access control list
  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 1940, in doPartialUpgrade
      if not self.askDistUpgrade():
             ~~~~~~~~~~~~~~~~~~~^^

    File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeController.py", line 1234, in askDistUpgrade
      res = self._view.confirmChanges(_("Do you want to start the upgrade?"),
                                      changes,
                                      self.cache.required_download)

    File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeViewGtk3.py", line 714, in confirmChanges
      pkg.name, GLib.markup_escape_text(getattr(pkg.candidate, "summary", None)))])
                ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    File "/usr/lib/python3/dist-packages/gi/overrides/GLib.py", line 417, in markup_escape_text
      return GLib.markup_escape_text(text, length)
             ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^

  TypeError: Argument 0 does not allow None as a value

  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 1940, in doPartialUpgrade
      if not self.askDistUpgrade():
             ~~~~~~~~~~~~~~~~~~~^^
    File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeController.py", line 1234, in askDistUpgrade
      res = self._view.confirmChanges(_("Do you want to start the upgrade?"),
                                      changes,
                                      self.cache.required_download)
    File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeViewGtk3.py", line 714, in confirmChanges
      pkg.name, GLib.markup_escape_text(getattr(pkg.candidate, "summary", None)))])
                ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/usr/lib/python3/dist-packages/gi/overrides/GLib.py", line 417, in markup_escape_text
      return GLib.markup_escape_text(text, length)
             ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  TypeError: Argument 0 does not allow None as a value
  ```

  ProblemType: Bug
  DistroRelease: Ubuntu 26.04
  Package: ubuntu-release-upgrader-gtk 1:26.04.13
  ProcVersionSignature: Ubuntu 7.0.0-10.10-generic 7.0.0-rc4
  Uname: Linux 7.0.0-10-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.33.1-0ubuntu7
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr  8 10:45:45 2026
  InstallationDate: Installed on 2022-03-20 (1480 days ago)
  InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
  PackageArchitecture: all
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)
  VarLogDistupgradeTermlog:

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