can't download this youtube video

[Teo]

$ youtube-dl https://www.youtube.com/watch?v=t0On9tbnKd8
[youtube] Setting language
[youtube] t0On9tbnKd8: Downloading video webpage
[youtube] t0On9tbnKd8: Downloading video info webpage
[youtube] t0On9tbnKd8: Extracting video information
[youtube] t0On9tbnKd8: Encrypted signatures detected.
ERROR: unable to download video

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: youtube-dl 2013.08.29-1
ProcVersionSignature: Ubuntu 3.11.0-20.34-generic 3.11.10.6
Uname: Linux 3.11.0-20-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
Date: Sun May 11 18:22:27 2014
InstallationDate: Installed on 2013-10-11 (211 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: youtube-dl
UpgradeStatus: Upgraded to saucy on 2014-02-23 (77 days ago)

[Daniel Letzeisen (dtl131)]

youtube changes its interface a lot, and Ubuntu does not update the youtube-dl package accordingly.

You would be better off downloading your own youtube-dl:
http://rg3.github.io/youtube-dl/download.html

Using the upstram version also makes it easier to update:
sudo youtube-dl -U

[Launchpad Janitor (janitor)]

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

[Rolf Leggewie (r0lf)]

works fine for me in trusty

$ youtube-dl https://www.youtube.com/watch?v=t0On9tbnKd8
[youtube] t0On9tbnKd8: Downloading webpage
[youtube] t0On9tbnKd8: Extracting video information
[youtube] t0On9tbnKd8: Downloading js player vflFAPa9H
[youtube] t0On9tbnKd8: Downloading js player vflFAPa9H
[youtube] t0On9tbnKd8: Downloading DASH manifest
[download] Destination: RADIO FUTURA - Enamorado de la moda juvenil-t0On9tbnKd8.mp4
[download] 100% of 11.57MiB in 02:15

and even lucid!

$ youtube-dl https://www.youtube.com/watch?v=t0On9tbnKd8
[youtube] Setting language
[youtube] t0On9tbnKd8: Downloading video webpage
[youtube] t0On9tbnKd8: Downloading video info webpage
[youtube] t0On9tbnKd8: Extracting video information
[download] Destination: t0On9tbnKd8.webm
[download] 100.0% of 11.76M at 237.81k/s ETA 00:00

[Rolf Leggewie (r0lf)]

does this ever occur for you in trusty or later?

[Teo (teo1978)]

On trusty:

$ youtube-dl https://www.youtube.com/watch?v=t0On9tbnKd8
[youtube] Setting language
[youtube] t0On9tbnKd8: Downloading webpage
[youtube] t0On9tbnKd8: Downloading video info webpage
[youtube] t0On9tbnKd8: Extracting video information
[youtube] t0On9tbnKd8: Encrypted signatures detected.
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 957, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 331, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'

WARNING: Warning: Falling back to static signature algorithm
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 957, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 331, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'

WARNING: Warning: Falling back to static signature algorithm
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 957, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 331, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'

WARNING: Warning: Falling back to static signature algorithm
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 957, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 331, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'

WARNING: Warning: Falling back to static signature algorithm
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 957, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 331, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'

WARNING: Warning: Falling back to static signature algorithm
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 957, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 331, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attri...

[Teo (teo1978)]

@2:

$ sudo youtube-dl -U
[sudo] password for teo:
It looks like you installed youtube-dl with a package manager, pip, setup.py or a tarball. Please use that to update.

[Eero (eero+launchpad)]

Please remove youtube-dl package from Ubuntu, if you're not going to maintain it and point people directly to the GithHub page.

[Unit 193 (unit193)]

Howdy,

This was upstream issue https://github.com/ytdl-org/youtube-dl/issues/3754, which was also reported in LP: #1402981 and has been (long since) fixed in Ubuntu.