Public bug reported:

WebEngineContext used before QtWebEngine::initialize() or OpenGL context 
creation failed.
Traceback (most recent call last):
  File "/usr/bin/ebook-convert", line 20, in <module>
    sys.exit(main())
  File "/usr/lib/calibre/calibre/ebooks/conversion/cli.py", line 401, in main
    plumber.run()
  File "/usr/lib/calibre/calibre/ebooks/conversion/plumber.py", line 1274, in 
run
    self.output_plugin.convert(self.oeb, self.output, self.input_plugin,
  File "/usr/lib/calibre/calibre/ebooks/conversion/plugins/pdf_output.py", line 
188, in convert
    self.convert_text(oeb_book)
  File "/usr/lib/calibre/calibre/ebooks/conversion/plugins/pdf_output.py", line 
253, in convert_text
    convert(
  File "/usr/lib/calibre/calibre/ebooks/pdf/html_writer.py", line 1195, in 
convert
    manager = RenderManager(opts, log, container.root)
  File "/usr/lib/calibre/calibre/ebooks/pdf/html_writer.py", line 279, in 
__init__
    ans.setUrlRequestInterceptor(self.interceptor)
AttributeError: 'QWebEngineProfile' object has no attribute 
'setUrlRequestInterceptor'

** Affects: calibre (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1888438

Title:
  Calibre fails to convert epub to pdf (Ubuntu 20.04)

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