Add support for Ubuntu 25.04 (plucky)

Closes #1090

dangerzone/gui/main_window.py

@@ -3,6 +3,7 @@ import os
 import platform
 import tempfile
 import typing
+from multiprocessing import freeze_support
 from multiprocessing.pool import ThreadPool
 from pathlib import Path
 from typing import List, Optional
@@ -1220,6 +1221,9 @@ class DocumentsListWidget(QtWidgets.QListWidget):
     def start_conversion(self) -> None:
         if not self.thread_pool_initized:
             max_jobs = self.dangerzone.isolation_provider.get_max_parallel_conversions()
+            # Call freeze_support() to avoid passing unknown options to the subprocess.
+            # See https://github.com/freedomofpress/dangerzone/issues/873
+            freeze_support()
             self.thread_pool = ThreadPool(max_jobs)
 
         for doc in self.docs_list:

dev_scripts/qa.py

@@ -1027,7 +1027,7 @@ class QAFedora(QALinux):
         )
 
 
-class QAFedora41(QAFedora):
+class QAFedora42(QAFedora):
     VERSION = "42"
 
 

tests/test_docs_large

@@ -1 +1 @@
-Subproject commit 0faa21eb4e33ec1a3212468dcb6db3a668cf8fc8
+Subproject commit 0068ffcb67f45fe9e3a082649493b7c8db5d1473