Calibre_parallel crashes during pdf to epub export

[davide cerrato]

Ubuntu 12.04
Calibre fails to convert to epub.
This is happening for all files
Below an error output as example

Calibre, version 0.8.38
ERROR: Conversion Error: <b>Failed</b>: Convert book 1 of 1 (Un Altro Giro Di Giostra)

Convert book 1 of 1 (Un Altro Giro Di Giostra)
Resolved conversion options
calibre version: 0.8.38
{'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0.0,
 'book_producer': None,
 'change_justification': u'original',
 'chapter': u"//*[((name()='h1' or name()='h2') and re:test(., '\\s*((chapter|book|section|part)\\s+)|((prolog|prologue|epilogue)(\\s+|$))', 'i')) or @class = 'chapter']",
 'chapter_mark': u'pagebreak',
 'comments': None,
 'cover': '/tmp/calibre_0.8.38_tmp_bAjnyt/w6E1Y_.jpeg',
 'debug_pipeline': None,alibre, version 0.8.38
ERROR: Conversion Error: <b>Failed</b>: Convert book 1 of 1 (Un Altro Giro Di Giostra)

Convert book 1 of 1 (Un Altro Giro Di Giostra)
Resolved conversion options
calibre version: 0.8.38
{'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0.0,
 'book_producer': None,
 'change_justification': u'original',
 'chapter': u"//*[((name()='h1' or name()='h2') and re:test(., '\\s*((chapter|book|section|part)\\s+)|((prolog|prologue|epilogue)(\\s+|$))', 'i')) or @class = 'chapter']",
 'chapter_mark': u'pagebreak',
 'comments': None,
 'cover': '/tmp/calibre_0.8.38_tmp_bAjnyt/w6E1Y_.jpeg',
 'debug_pipeline': None,
 'dehyphenate': True,
 'delete_blank_paragraphs': True,
 'disable_font_rescaling': False,
 'dont_split_on_page_breaks': False,
 'duplicate_links_in_toc': False,
 'enable_heuristics': False,
 'epub_flatten': False,
 'extra_css': None,
 'extract_to': None,
 'filter_css': u'',
 'fix_indents': True,
 'flow_size': 260,
 'font_size_mapping': None,
 'format_scene_breaks': True,
 'html_unwrap_factor': 0.4,
 'input_encoding': None,
 'input_profile': <calibre.customize.profiles.InputProfile object at 0x9da768c>,
 'insert_blank_line': False,
 'insert_blank_line_size': 0.5,
 'insert_metadata': False,
 'isbn': None,
 'italicize_common_cases': True,
 'keep_ligatures': False,
 'language': None,
 'level1_toc': None,
 'level2_toc': None,
 'level3_toc': None,
 'line_height': 0.0,
 'linearize_tables': False,
 'margin_bottom': 5.0,
 'margin_left': 5.0,
 'margin_right': 5.0,
 'margin_top': 5.0,
 'markup_chapter_headings': True,
 'max_toc_links': 50,
 'minimum_line_height': 120.0,
 'new_pdf_engine': False,
 'no_chapters_in_toc': False,
 'no_default_epub_cover': False,
 'no_images': False,
 'no_inline_navbars': False,
 'no_svg_cover': False,
 'output_profile': <calibre.customize.profiles.OutputProfile object at 0xa48892c>,
 'page_breaks_before': u"//*[name()='h1' or name()='h2']",
 'prefer_metadata_cover': False,
 'preserve_cover_aspect_ratio': False,
 'pretty_print': True,
 'pubdate': None,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': '/tmp/calibre_0.8.38_tmp_bAjnyt/p6KZ_t.opf',
 'remove_fake_margins': True,
 'remove_first_image': False,
 'remove_paragraph_spacing': False,
 'remove_paragraph_spacing_indent_size': 1.5,
 'renumber_headings': True,
 'replace_scene_breaks': u'',
 'series': None,
 'series_index': None,
 'smarten_punctuation': False,
 'sr1_replace': None,
 'sr1_search': None,
 'sr2_replace': None,
 'sr2_search': None,
 'sr3_replace': None,
 'sr3_search': None,
 'tags': None,
 'timestamp': None,
 'title': None,
 'title_sort': None,
 'toc_filter': None,
 'toc_threshold': 6,
 'unsmarten_punctuation': False,
 'unwrap_factor': 0.45,
 'unwrap_lines': True,
 'use_auto_toc': False,
 'verbose': 2}
Traceback (most recent call last):
  File "/usr/bin/calibre-parallel", line 19, in <module>
    sys.exit(main())
  File "/usr/lib/calibre/calibre/utils/ipc/worker.py", line 191, in main
    result = func(*args, **kwargs)
  File "/usr/lib/calibre/calibre/gui2/convert/gui_conversion.py", line 31, in gui_convert_override
    override_input_metadata=True)
  File "/usr/lib/calibre/calibre/gui2/convert/gui_conversion.py", line 25, in gui_convert
    plumber.run()
  File "/usr/lib/calibre/calibre/ebooks/conversion/plumber.py", line 920, in run
    import cssutils, logging
  File "/usr/lib/python2.7/dist-packages/cssutils/__init__.py", line 109, in <module>
    from . import util
  File "/usr/lib/python2.7/dist-packages/cssutils/util.py", line 20, in <module>
    from _fetch import _defaultFetcher
  File "/usr/lib/python2.7/dist-packages/cssutils/_fetch.py", line 8, in <module>
    import encutils
ImportError: No module named encutils

 'dehyphenate': True,
 'delete_blank_paragraphs': True,
 'disable_font_rescaling': False,
 'dont_split_on_page_breaks': False,
 'duplicate_links_in_toc': False,
 'enable_heuristics': False,
 'epub_flatten': False,
 'extra_css': None,
 'extract_to': None,
 'filter_css': u'',
 'fix_indents': True,
 'flow_size': 260,
 'font_size_mapping': None,
 'format_scene_breaks': True,
 'html_unwrap_factor': 0.4,
 'input_encoding': None,
 'input_profile': <calibre.customize.profiles.InputProfile object at 0x9da768c>,
 'insert_blank_line': False,
 'insert_blank_line_size': 0.5,
 'insert_metadata': False,
 'isbn': None,
 'italicize_common_cases': True,
 'keep_ligatures': False,
 'language': None,
 'level1_toc': None,
 'level2_toc': None,
 'level3_toc': None,
 'line_height': 0.0,
 'linearize_tables': False,
 'margin_bottom': 5.0,
 'margin_left': 5.0,
 'margin_right': 5.0,
 'margin_top': 5.0,
 'markup_chapter_headings': True,
 'max_toc_links': 50,
 'minimum_line_height': 120.0,
 'new_pdf_engine': False,
 'no_chapters_in_toc': False,
 'no_default_epub_cover': False,
 'no_images': False,
 'no_inline_navbars': False,
 'no_svg_cover': False,
 'output_profile': <calibre.customize.profiles.OutputProfile object at 0xa48892c>,
 'page_breaks_before': u"//*[name()='h1' or name()='h2']",
 'prefer_metadata_cover': False,
 'preserve_cover_aspect_ratio': False,
 'pretty_print': True,
 'pubdate': None,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': '/tmp/calibre_0.8.38_tmp_bAjnyt/p6KZ_t.opf',
 'remove_fake_margins': True,
 'remove_first_image': False,
 'remove_paragraph_spacing': False,
 'remove_paragraph_spacing_indent_size': 1.5,
 'renumber_headings': True,
 'replace_scene_breaks': u'',
 'series': None,
 'series_index': None,
 'smarten_punctuation': False,
 'sr1_replace': None,
 'sr1_search': None,
 'sr2_replace': None,
 'sr2_search': None,
 'sr3_replace': None,
 'sr3_search': None,
 'tags': None,
 'timestamp': None,
 'title': None,
 'title_sort': None,
 'toc_filter': None,
 'toc_threshold': 6,
 'unsmarten_punctuation': False,
 'unwrap_factor': 0.45,
 'unwrap_lines': True,
 'use_auto_toc': False,
 'verbose': 2}
Traceback (most recent call last):
  File "/usr/bin/calibre-parallel", line 19, in <module>
    sys.exit(main())
  File "/usr/lib/calibre/calibre/utils/ipc/worker.py", line 191, in main
    result = func(*args, **kwargs)
  File "/usr/lib/calibre/calibre/gui2/convert/gui_conversion.py", line 31, in gui_convert_override
    override_input_metadata=True)
  File "/usr/lib/calibre/calibre/gui2/convert/gui_conversion.py", line 25, in gui_convert
    plumber.run()
  File "/usr/lib/calibre/calibre/ebooks/conversion/plumber.py", line 920, in run
    import cssutils, logging
  File "/usr/lib/python2.7/dist-packages/cssutils/__init__.py", line 109, in <module>
    from . import util
  File "/usr/lib/python2.7/dist-packages/cssutils/util.py", line 20, in <module>
    from _fetch import _defaultFetcher
  File "/usr/lib/python2.7/dist-packages/cssutils/_fetch.py", line 8, in <module>
    import encutils
ImportError: No module named encutils

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Graham Inggs (ginggs)]

cssutils/_fetch.py tries to import encutils which is no longer in a seperate package

[Graham Inggs (ginggs)]

In Precise, removing the line:

import encutils

from /usr/lib/python2.7/dist-packages/cssutils/_fetch.py , fixes the problem in Calibre.

There is a try/except block in cssutils/script.py that imports encutils as well, but it doesn't get called by Calibre.

[Stefano Rivera (stefanor)]

Graham: Why would we remove an import that's used?

The encutils module is included in python-cssutils. Why is it failing to import? That's the real question here

[Graham Inggs (ginggs)]

After shutting down and later powering up the machine that experienced the problem, I have been unable to reproduce it.
It was reproducible before shutting down though, and came and went as I removed and re-inserted the line mentioned above.

I think I need to find why a URL needed to be fetched at all, rather than trying to block it in cssutils.
Perhaps there are still some upgrade checks that need to be removed from Calibre.