Calibre_parallel crashes during pdf to epub export

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