[Bug 2144546] Re: GLib.markup_escape_text TypeError in DistUpgradeViewGtk3

[Nick Rosbrook]

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

** Changed in: ubuntu-release-upgrader (Ubuntu)
    Milestone: None => ubuntu-26.04

** Tags added: rls-rr-incoming

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https://bugs.launchpad.net/bugs/2144546

Title:
  GLib.markup_escape_text TypeError in DistUpgradeViewGtk3

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  Location: DistUpgradeViewGtk3.py, line 714, in confirmChanges()

  Error:

  TypeError: Argument 0 does not allow None as a value
  Cause:
  confirmChanges() passes the result of getattr(pkg.candidate, "summary", None) to GLib.markup_escape_text(). When a package has no candidate or no summary, this is None. GLib.markup_escape_text() expects a string and does not accept None, so it raises the above TypeError.

  When it happens:
  During a distribution upgrade or partial upgrade when the GTK3 UI shows the confirmation dialog and one of the packages in the change list has a missing or empty summary.

  Impact:
  The upgrade UI crashes instead of showing the confirmation dialog, blocking the upgrade.

  Fix:
  Ensure a string is always passed to GLib.markup_escape_text(), e.g. by using an empty string when the summary is None:

  GLib.markup_escape_text(getattr(pkg.candidate, "summary", None) or "")

  Status:
  No matching bug found on Launchpad; this appears to be a new report.

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