download failure from Ubuntu - previously OK

[adisis]

nicholas@Desktop:~/Downloads$ youtube-dl http://www.youtube.com/watch?v=sOrEfH4s668 --verbose
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['http://www.youtube.com/watch?v=sOrEfH4s668', '--verbose']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.06.02
[debug] Python version 2.7.6 - Linux-3.13.0-27-generic-x86_64-with-Ubuntu-14.04-trusty
[debug] Proxy map: {}
[youtube] Setting language
[youtube] sOrEfH4s668: Downloading webpage
[youtube] sOrEfH4s668: Downloading video info webpage
[youtube] sOrEfH4s668: Extracting video information
[youtube] sOrEfH4s668: Encrypted signatures detected.
[youtube] encrypted signature length 82 (41.40), itag 22, html5 player en_US-vflazPBMd
[youtube] sOrEfH4s668: Downloading js player vflazPBMd
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 873, in _decrypt_signature
video_id, player_url, len(s)
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 375, in _extract_signature_function
res = self._parse_sig_js(code)
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 443, in _parse_sig_js
u'Initial JS player signature function name')
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 379, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)

[jaimeMF]

Duplicate of #3104, run sudo youtube-dl -U to upgrade to the last version.